Completing your tax return often feels like the finish line — but it’s actually an ideal starting point. This is a valuable opportunity to step back, reset and refocus on your personal finances, using your return as a planning tool for the months ahead. A prior-year tax return isn’t just a record of what happened, it’s a roadmap for what to do next.
One of the most important starting points is understanding where your taxable income fell within the federal ordinary income tax brackets. This means focusing on taxable income, not gross income. Taxable income determines your marginal tax rate and can guide key decisions, such as whether to contribute to Roth accounts (pay taxes now for tax-free growth later) or pre-tax accounts (receive a deduction today and defer taxes).
Make Use of MAGI
In addition to taxable income, reviewing your modified adjusted gross income (MAGI) can reveal meaningful planning opportunities. Many tax credits, deductions and eligibility thresholds are tied directly to MAGI, making it a critical number for forward-looking planning. Unlike taxable income, which determines what you owe, MAGI often determines what you qualify for. (Note that the calculation for MAGI isn’t always the same. Carefully read the IRS rules to ensure you use the correct calculation.)
For example, MAGI plays a key role in determining eligibility for direct Roth IRA contributions. If your income exceeds the allowable limits, a backdoor Roth IRA strategy may be appropriate. For higher-income earners, this can be an effective way to continue building tax-free assets and create greater flexibility and control over taxes in retirement.
MAGI is also especially important for retirees. For individuals on Medicare, income levels directly impact premium costs through the Income-Related Monthly Adjustment Amount (IRMAA). Even modest income increases can push retirees into higher premium brackets. By proactively managing income sources such as IRA distributions, capital gains or Roth conversions, retirees can potentially avoid unnecessary increases in health-care costs. In this context, MAGI becomes a key lever in managing not just taxes, but overall retirement expenses.
Review Withholding and Charitable Giving Plans
Another critical area to evaluate is tax withholding. If you owed a large amount or received a sizable refund, it may be time to adjust. Under withholding can lead to penalties and unexpected tax bills, while over withholding means you’ve effectively given the IRS an interest-free loan. Dialing this in properly can improve monthly cash flow and create opportunities to redirect funds toward savings or investments. This applies to both working individuals adjusting paycheck withholdings and retirees managing distributions from retirement accounts, pension or annuity payments, and Social Security benefits.
Recent tax law changes have also created new planning considerations. With the continued expansion of the standard deduction, many taxpayers are no longer itemizing. However, for those who are close to the threshold, “bunching” charitable contributions into a single year can be an effective strategy to maximize deductions. For charitably inclined individuals, this approach can be even more powerful when combined with donating appreciated assets, such as stock, rather than cash. This allows you to avoid capital gains taxes while still receiving a full charitable deduction, increasing the overall tax efficiency of your giving strategy.
Ultimately, reviewing your tax return early in the year provides a full runway to adjust and take advantage of opportunities before the next year-end deadlines arrive. Working with a CFP® professional can help translate what your tax return reveals into actionable strategies that improve cash flow, enhance tax efficiency and keep your financial goals on track.
Because once tax season ends, the real planning begins.
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