Q1 2024 Supplementary financial information

Note to Readers: Restated Results on Adoption of IFRS 17 and IFRS 9

Sun Life Financial Inc. ('the Company", "Sun Life","we","our" and "us") adopted IFRS 17 Insurance Contracts and IFRS 9 Financial Instruments ("IFRS 17" and "IFRS 9", respectively, and "IFRS 17/9", collectively) on January 1, 2023. For IFRS 9, we elected not to restate comparative period results, but will present comparative information on financial assets as if IFRS 9 were applicable during the 2022 comparative period ("classification overlay"). 2022 results have been restated for the adoption of IFRS 17 and the related IFRS 9 classification overlay ("the new standards").The restated results may not be fully representative of our future earnings profile, as in 2022 we were not managing our asset and liability portfolios under the new standards. The majority of the actions taken to re-balance asset portfolios and transition asset-liability management execution to an IFRS 17 basis occurred in Q1 2023. Accordingly, analysis based on 2022 comparative results may not necessarily be indicative of future trends, and should be interpreted with this context. Using sensitivities to analyze the outlook for market risk and related impacts (e.g., interest rate sensitivities) will be more representative starting with the sensitivities disclosed for Q1 2023 and onwards in section I - Risk Management of the Company's Management's Discussion and Analysis ("MD&A") for each respective quarter. Certain 2022 restated results and 2023 interim results in the Drivers of Earnings and CSM Movement Analysis were refined to more accurately reflect how the business is managed.

Basis of Presentation

All amounts in this document are presented in millions of Canadian dollars unless otherwise indicated. We prepare our unaudited Interim Consolidated Financial Statements using International Financial Reporting Standards ("IFRS"), the accounting requirements of the Office of the Superintendent of Financial Institutions ("OSFI") and in accordance with the International Accounting Standards ("IAS") 34 Interim Financial Reporting as issued and adopted by the International Accounting Standards Board ("IASB"). Reported net income (loss) refers to common shareholders' net income (loss) determined in accordance with IFRS.

This document and the Q1 2024 MD&A contain certain amounts that are presented on a net basis to reflect how the business is managed, compared to a gross basis in the Consolidated Financial Statements. Examples include:

1. Within the Drivers of Earnings: i) Net investment result and Other expenses of the Asset Management operating segment are combined with Fee Income to report the net contribution to earnings; ii) Income for fee-based businesses is reported net of the associated expenses; iii) Carried interest in SLC Management excludes the carried interest that Sun Life does not participate in economically, and nets the non-controlling interest against fee income and expenses of consolidated funds; iv) Net investment results include assets returns net of the crediting rate for investment contract liabilities and the unwinding of and changes in the discount rate for insurance contract liabilities; v) Earnings on surplus reflects net spread earned from investment strategies; vi) Earnings attributable to the participating account are excluded; and vii) Assumption changes and management actions combines the amounts included in Net insurance service result and Net investment result.
2. Within the CSM Movement Analysis: i) The impacts of insurance contracts issued is presented net of reinsurance; ii) Impact of new business is presented net of acquisition expense gain/loss; and iii) Certain methodology changes are presented as an impact of change in assumptions, whereas the Consolidated Financial Statement presentation is a contract modification.

For more information on the Drivers of Earnings and CSM Movement Analysis, refer to the Non-IFRS Financial Measures section on the subsequent page of this document or Section N. Non-IFRS Financial Measures of the Company's Q1 2024 MD&A. For the reconciliations of the Statements of Operations to the DOE, refer to the Drivers of Earnings Reconciliations section in the appendix of this document.

Constant Currency Measures

Constant currency measures are calculated using the average currency and period end rates, as appropriate, in effect in the comparable period. Constant currency measures are non-IFRS financial measures. See Section N. Non-IFRS Financial Measures, 3. Additional Non-IFRS Financial Measures of the Company's Q1 2024 MD&A.

Rounding

Amounts in this document may be impacted by rounding.

Adjustments

Acquisition, Integration and Restructuring

In Q1 2024 amounts include DentaQuest Group, Inc. ("DentaQuest") integration costs of $29 million post-tax and the unwinding of the discount for Other financial liabilities of $22 million post-tax for BentallGreenOak ("BGO"), InfraRed Capital Partners ("InfraRed") the Crescent Capital Group LP ("Crescent") and Advisors Asset Management Inc. ("AAM") (collectively, "SLC Management's affiliates"). Amounts also include a gain from the partial sale of our ownership interest in Aditya Birla Sun Life AMC Limited ("ABSLAMC") of $84 million post-tax. As a result of the transaction, our ownership interest in ABSLAMC was reduced from 36.5% to 30.2%.

In Q4 2023, amounts include DentaQuest integration costs of $28 million post-tax and the unwinding of the discount for Other financial liabilities of $24 million post-tax for SLC Management's affiliates.

In Q3 2023, amounts include DentaQuest integration costs of $31 million post-tax and the unwinding of the discount for Other financial liabilities of $21 million post-tax for SLC Management's affiliates.

In Q2 2023, amounts include DentaQuest integration costs of $32 million post-tax and the unwinding of the discount for Other financial liabilities of $21 million post-tax for SLC Management's affiliates. Amounts also include a $19 million post-tax gain resulting from the completion of the sale of SLF of Canada UK Limited to Phoenix Group Holdings plc ("Phoenix Group") on April 3, 2023 ("the sale of Sun Life UK"). After the sale, the remaining UK payout annuities business has moved to the U.S. business segment and is combined with U.S. In-force Management.

In Q1 2023, amounts include DentaQuest integration costs of $29 million post-tax and AAM acquisition costs of $16M post-tax, as well as the unwinding of the discount for Other financial liabilities of $20 million post-tax for SLC Management's affiliates. Amounts also include Canada's $65 million post-tax gain on sale of its sponsored markets business to Canadian Premier Life Insurance Company (re-branded to Securian Canada), which was recognized in Other income.

In Q4 2022, amounts include DentaQuest integration costs of $59 million post-tax and the unwinding of the discount for Other financial liabilities of $17 million post-tax for SLC Management's affiliates, BGO, InfraRed, and Crescent.

In Q3 2022, amounts include DentaQuest integration costs of $24 million post-tax and the unwinding of the discount for Other financial liabilities of $15 million post-tax for SLC Management's affiliates. Amounts also include the changes in estimated future payments for acquisition-related contingent considerations and options to purchase remaining ownership interests of SLC Management affiliates in the amount of $80 million post-tax, as well as an impairment charge of $170 million (£108 million) pertaining to the attributed goodwill that is not expected to be recovered through the sale of Sun Life UK to Phoenix Group.

In Q2 2022, amounts include acquisition costs for DentaQuest of $49 million post-tax and unwinding of the discount for Other financial liabilities of $16 million post-tax for SLC Management's affiliates.

In Q1 2022, amounts include unwinding of the discount for Other financial liabilities of $16 million post-tax for SLC Management's affiliates.

Other

Q1 2024: Amounts include a gain relating to the early termination of a distribution agreement in Asset Management.

Q4 2023: On December 27, 2023, Bermuda enacted its Corporate Income Tax Act 2023, which will apply a 15% income tax beginning on January 1, 2025 ("Bermuda Corporate Income Tax Change"). The enacted legislation provides an economic transition adjustment that aligns an entity's starting point for the tax regime more closely with its economic position prior to the application of the Corporate Income Tax 2023. The benefit of this economic transition adjustment has been recognized in 2023. As a result, reported net income increased by $51 million in the fourth quarter, reflected in Other adjustments.

Q4 2022: On December 15, 2022, legislation implementing an additional surtax of 1.5% applicable to banks and life insurers' taxable income in excess of $100 million was enacted in Canada ("Canada Tax Rate Change"). This legislation applies retroactively to the Federal Budget date of April 7, 2022. As a result, Reported net income increased by $141 million in the fourth quarter, reflected in Other adjustments, of which $90 million was in Canada and $51 million was in Corporate.

Q3 2022: In October 2022, a matter related to reinsurance pricing for our U.S. In-force Management business was resolved, resulting in a charge of $48 million (US$37 million) post-tax in the third quarter and a further charge of $11 million (US$8 million) post-tax in the fourth quarter of 2022.

Q2 2022: There was a $94 million pre-tax or $75 million post-tax gain related to the sale-leaseback arrangement on our Wellesley property, including the write-off of leasehold improvements ("Sale of Wellesley Property in the U.S.").

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Non-IFRS Financial Measures

Sun Life prepares annual and interim financial statements using IFRS. We report certain financial information that are not based on IFRS ("non-IFRS financial measures"), as we believe that these measures provide information that is useful to investors in understanding our performance and facilitate a comparison of our quarterly and full year results from period to period. These non-IFRS financial measures do not have any standardized meaning and may not be comparable with similar measures used by other companies. For certain non-IFRS financial measures, there are no directly comparable amounts under IFRS. These non-IFRS financial measures should not be viewed in isolation from or as alternatives to measures of financial performance determined in accordance with IFRS. Additional information concerning non-IFRS financial measures and, if applicable, reconciliations to the closest IFRS measures are available in the Company's annual and interim MD&A and the Supplementary Financial Information packages on www.sunlife.comunder Investors - Financial results and reports.

Underlying Net Income

Underlying net income is a non-IFRS financial measure that assists in understanding Sun Life's business performance by making certain adjustments to IFRS income. Underlying net income, along with common shareholders' net income (Reported net income), is used as a basis for management planning, and is also a key measure in our employee incentive compensation programs. This measure reflects management's view of the underlying business performance of the Company and long-term earnings potential. For example, due to the longer term nature of our individual protection businesses, market movements related to interest rates, equity markets and investment properties can have a significant impact on Reported net income in the reporting period. However, these impacts are not necessarily realized, and may never be realized, if markets move in the opposite direction in subsequent periods or, in the case of interest rates, the fixed income investment is held to maturity.

Underlying net income removes the impact of the following items from reported net income:

• Market-relatedimpacts reflecting the after-tax difference in actual versus expected market movements, including:
  i. Net interest impact from risk-free rate, credit spread, and swap spread movements, reflecting accounting mismatches between assets and liabilities:
• 1. Differences arising from fair value changes(1) of fixed income assets (including derivatives) measured at Fair value through profit or loss ("FVTPL") supporting insurance contracts, compared to fair value changes of the liabilities (2);
  2. Fair value changes of fixed income assets (including derivatives) measured at FVTPL supporting our investment contract liability and surplus portfolios(3); and
  3. Tax-exemptinvestment income above or below expected long-term tax savings relating to our Canadian multi-national insurance operations.

• 1. Non-fixedincome investments, where the weighted average expected retuis approximately 2% per quarter, including:
  2. 1. Equity investments (including derivatives) supporting insurance contracts and surplus portfolios; and
     2. Investment properties supporting insurance contracts and surplus portfolios.
• Assumptions changes and management actions ("ACMA") - captures the impact of method and assumption changes, and management actions on insurance and reinsurance contracts.
• Other adjustments:
• 1. Management's ownership of MFS shares - this adjustment removes the change in fair value and other activity related to MFS common shares owned by management;

1. Acquisition, integration, and restructuring - expense and income related to acquisition or disposal of a business. Also includes expenses related to restructuring activities;
2. Intangible asset amortization - removes the amortization expense associated with finite life intangible assets arising from acquisitions or business combinations excluding amortization of software and distribution agreements; and
3. Other - represents items that are unusual or exceptional in nature which management believes are not representative of the long-term performance of the Company.

Refer to Net Income Reconciliations - Pre-Tax and Post-Tax in the appendix of this document for the non-underlying adjustments from underlying net income to reported net income, as well as Section N. Non-IFRS Financial Measures, 2. Underlying Net Income and Underlying EPS and 4. Reconciliations of Select Non-IFRS Financial Measures of the Company's Q1 2024 MD&A.

For more information about business types in Sun Life's operating segments/business groups, see the General Information section of this document and Section A. How We Report Our Results under the heading Underlying Net Income by Business Types of the Company's Q1 2024 MD&A.

Underlying Diluted Earnings per Share (EPS)

This measure is used in comparing the profitability across multiple periods and is calculated by dividing Underlying net income by weighted average common shares outstanding for diluted EPS, excluding the dilutive impact of convertible instruments. For additional information about the Underlying net income, see above. For additional information about the composition of the EPS, please refer to Note 13 of our Q1 2024 Consolidated Financial Statements for the period ended March 31, 2024. For additional information about the SLEECS, please refer to Note 12 of our 2023 Annual Consolidated Financial Statements.

Drivers of Earnings (DOE)

The DOE analysis provides additional detail on the sources of earnings, primarily for protection and health businesses, and explains the actual results compared to the longer term expectations. The DOE is presented on a reported and underlying common shareholders' basis. Within the net insurance service result, the underlying DOE provides detail on expected insurance earnings, impact of new insurance business and experience gains (losses). Within the net investment result, the underlying DOE provides detail on expected investment earnings, credit experience, earnings on surplus, and joint ventures & other. For more information on the DOE, see Understanding the Drivers of Earnings in the appendix of this document and Section N. Non-IFRS Financial Measures, 3. Additional Non-IFRS Financial Measures under the heading Driver of Earnings of the Company's Q1 2024 MD&A. Refer to the Basis of Presentation section on page ii of this document for more information about certain amounts that are presented on a net basis to reflect how the business is managed, compared to a gross basis in the Consolidated Financial Statements, and the reconciliations of the Statements of Operations to the DOE in the Drivers of Earnings Reconciliations section in the appendix of this document.

Contractual Service Margin (CSM)

Contractual Service Margin represents a source of stored value for future insurance profits and qualifies as available capital for LICAT(4) purposes. CSM is a component of insurance contract liabilities. Refer to the Basis of Presentation section on page ii of this document for more information about certain amounts that are presented on a net basis to reflect how the business is managed, compared to a gross basis in the Consolidated Financial Statements.

• Organic CSM Movement is comprised of the Impact of new insurance business, Expected movements from asset returns & locked-in rates, Insurance experience gains/losses, and CSM recognized for services provided
• Impact of new insurance business on CSM, also referred to as "new business CSM", represents growth from sales activity in the period, including individual protection sales (excluding joint ventures), and defined benefit solutions and segregated fund wealth sales in Canada. New business CSM is presented net of acquisition expense gain/loss.
• Expected movements from asset returns & locked-in rates applies to variable fee approach ("VFA") and general measurement approach ("GMA") contracts. For VFA contracts, this component of the CSM movement analysis is comprised of two factors: (i) the expected retuon underlying assets and (ii) the measurement of financial guarantees. The difference between actual and expected results are reported as the impact of markets. For GMA contracts, this component of the CSM includes the accretion of the CSM balance at locked-in rates, which refer to the term structure associated with locked-in discount rates, set when the insurance contract was sold or on transition to IFRS 17. Average locked-in rates increase with the passage of time on in-force business and new business added at current rates.
• Impact of markets & other includes the difference between actual and expected movement for VFA contracts for: (i) the retuon underlying assets and (ii) the measurement of financial guarantees. Also includes other amounts excluded from Organic CSM Movement.
• Insurance experience gains/losses represents the current period impacts of insurance experience, resulting in a change in future cash flows that adjust CSM.
• Impact of change in assumptions represents the future period impacts of changes in fulfilment cash flows that adjust CSM.

1. For fixed income assets, Underlying net income includes credit experience from rating changes on assets measured at FVTPL, and the Expected credit loss ("ECL") impact for assets measured at Fair value through other comprehensive income ("FVOCI").
2. Underlying net income is based on observable discount curves and exchange rates at the beginning of the period.
3. Underlying net income for earnings on surplus includes realized gains (losses) on fixed income assets classified as FVOCI.
4. Life Insurance Capital Adequacy Test ("LICAT") ratio. Our LICAT ratios are calculated in accordance with the OSFI-mandated guideline, Life Insurance Capital Adequacy Test.

1

1. Represents a non-IFRS financial measure. Refer to the Non-IFRS Financial Measures section on page 1 and the Additional Non-IFRS Financial Measures Glossary in the appendix of this document,or Section N. Non-IFRS Financial Measures of the Company's Q1 2024 MD&A.
2. Reported dividend payout ratio in Q3 2022 is "nm" that is defined as not meaningful.
3. Life Insurance Capital Adequacy Test ("LICAT") ratio. Our LICAT ratios are calculated in accordance with OSFI-mandated guideline, Life Insurance Capital Adequacy Test. Sun Life Assurance Company of Canada ("SLA" or "Sun Life Assurance") is SLF Inc.'s principal operating life insurance subsidiary.
4. Effective Q4 2023, prior period amounts related to sales in the U.S. Dental segment have been restated to reflect new information.

2

1. Certain numbers have been rounded in order to arrive at the number of common shares outstanding at end of period.
2. The number of diluted shares outstanding reflect the impact of dilution from the Sun Life ExchangEable Capital Securities (SLEECS) under IFRS. Where the calculation of diluted EPS has resulted in anti-dilution, the dilutive impact of the SLEECS has been excluded in the number of weighted average number of shares outstanding.
3. Represents a non-IFRS financial measure. Refer to the Non-IFRS Financial Measures section on page 1 and the Additional Non-IFRS Financial Measures Glossary in the appendix of this document, or Section N. Non-IFRS Financial Measures of the Company's Q1 2024 MD&A.

3

1. Refer to the Notes page ii, Adjustments - Acquisition, Integration and Restructuring and Adjustments - other for additional details.
2. Represents a non-IFRS financial measure. Refer to the Non-IFRS Financial Measures section on page 1 and the Additional Non-IFRS Financial Measures Glossary in the appendix of this document, or Section N. Non-IFRS Financial Measures of the Company's Q1 2024 MD&A.

4

1. The Drivers of Earnings analysis and Underlying Net Income by Business Type contain non-IFRS financial measures. Refer to the Non-IFRS Financial Measures section on page 1 and the Additional Non-IFRS Financial Measures Glossary in the appendix of this document, or Section N. Non-IFRS Financial Measures of the Company's Q1 2024 MD&A. Refer to the Basis of Presentation section on page ii of this document for more information about certain amounts that are presented on a net basis to reflect how the business is managed, compared to a gross basis in the Consolidated Financial Statements.
2. Effective Q4 2023, prior period amounts in the DOE related to Expenses - other for health, wealth and asset management businesses in Canada have been restated to improve comparability of data over time and with other business units; related amounts in Other fee income and Experience gains (losses) have also been restated accordingly. In addition, effective Q3 2023, the Other Fee Income line for the U.S. business segment has been refined to include Group Benefits and Health & Risk Solutions fee income net of corresponding expenses in order to align with the presentation of the Dental business in this line. We have updated prior period amounts to reflect this refinement.
3. Expenses - other removes non-underlying Other adjustments, including Management's ownership of MFS shares, Acquisition, integration and restructuring, and Intangible asset amortization. Certain Other adjustments - other may also be removed from Other expenses.
4. Dividends on preferred shares, distributions on other equity instruments, and non-controlling interests ("Dividends, distributions, NCI").
5. Refer to the Notes page ii, Adjustments - Acquisition, Integration and Restructuring and Adjustments - other for additional details.

5

1. The Drivers of Earnings analysis and Underlying Net Income by Business Type contain non-IFRS financial measures. Refer to the Non-IFRS Financial Measures section on page 1 and the Additional Non-IFRS Financial Measures Glossary in the appendix of this document, or Section N. Non-IFRS Financial Measures of the Company's Q1 2024 MD&A. Refer to the Basis of Presentation section on page ii of this document for more information about certain amounts that are presented on a net basis to reflect how the business is managed, compared to a gross basis in the Consolidated Financial Statements.
2. Effective Q4 2023, prior period amounts in the DOE related to Expenses - other for health, wealth and asset management businesses in Canada have been restated to improve comparability of data over time and with other business units; related amounts in Other fee income and Experience gains (losses) have also been restated accordingly. In addition, effective Q3 2023, the Other Fee Income line for the U.S. business segment has been refined to include Group Benefits and Health & Risk Solutions fee income net of corresponding expenses in order to align with the presentation of the Dental business in this line. We have updated prior period amounts to reflect this refinement.
3. Expenses - other removes non-underlying Other adjustments, including Management's ownership of MFS shares, Acquisition, integration and restructuring, and Intangible asset amortization. Certain Other adjustments - other may also be removed from Other expenses.
4. Refer to the Notes page ii, Adjustments - Acquisition, Integration and Restructuring and Adjustments - other for additional details.

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