The type of records you need varies by the type income you have. You don't have to provide proof of how you figured the amount of income for each quarter when you file the return, but if you are audited, you may be asked to provide it.
If you have a business, you can use your monthly or quarterly profit and loss statement. If you have investment income, you can refer to monthly statements, or your consolidated 1099 details to see when income was credited to your account and when gains and losses occurred.
Some of your income is likely the same all year. If you receive Social Security, or a pension, that sort of income would be 25% of the total per quarter.
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