Your tax bracket tells you almost nothing about what your next dollar costs. Harbor computes your federal and state tax on Social Security, pensions, and IRA withdrawals — and shows the four numbers that actually decide a retiree's bill.
Our focus is people close to or in retirement — so the questions lead with Social Security, pensions, and IRA income. But the tax math is general, and anyone can use this estimator.
A tax bracket is the rate on your last ordinary dollar — and for a retiree that is rarely the number that matters. Here's what actually drives the bill.
Your bracket says 12%; your next withdrawal can cost 25.5%, because that dollar pushes capital gains or Social Security over a hidden edge. It's the single most useful number for any retirement-income move — and no bracket chart shows it.
Federal tax is only part of the bill. Harbor models every one of the 41 income-taxing states (and DC) with their real brackets, standard deductions, and retirement-income exclusions — so the difference between New York and Florida shows up in dollars.
As other income rises, more of your benefit becomes taxable — up to 85%. Harbor shows exactly how much already counts as income, and when the torpedo has fully fired and more income can't drag any more of your benefit in.
A single dollar over a Medicare income threshold can raise your Part B and Part D premiums for a whole year. Harbor shows your headroom before the next cliff — and whether your next withdrawal trips it.
Social Security, private pensions, government and military pensions, and IRA withdrawals are each taxed differently — and differently again by state. Harbor keeps them apart instead of lumping them into one number.
Your effective rate, your marginal rate, the federal-and-state split, and the balance still due after what's already been withheld — then a clean sheet you can print for your records.
Filing status, both ages, and the state you retire in. A few fields, and no account to create.
Social Security, pensions, IRA withdrawals, dividends, and interest — each entered the way it's actually taxed.
Standard or itemized, plus the senior deduction and your state's retirement-income subtractions — applied for you.
Effective rate, real marginal rate, the federal and state split, and what's still owed. Print it.
The questions the tool is built to answer — spelled out here for search engines and for you.
No. Your bracket is the rate on your last dollar of ordinary income. Your effective rate — total tax divided by income — is usually much lower. Your true marginal rate, what your next withdrawal actually costs, is often much higher, because that dollar can push capital gains or more of your Social Security into tax. Harbor shows all three, side by side.
No. Our focus is people close to or in retirement, so the questions lead with Social Security, pensions, and IRA withdrawals. But the tax math is general — the estimator also handles wages, self-employment, rental, and investment income, so anyone can use it for a full federal and state estimate.
Yes. Harbor models all 41 states, plus DC, that tax income — using each state's real brackets, standard deduction, and retirement-income exclusions, not a flat national average. If you don't tell it where you live, it estimates your federal tax only and shows no state line.
Up to 85% of a Social Security benefit can be taxable, depending on your other income. Harbor computes the taxable share and shows when you've reached the 85% ceiling — the point where more income cannot pull any more of your benefit into tax. It also shows how much your benefit adds to the tax on your next withdrawal.
It's free, with no sign-up. Everything is computed in your browser — your income, your Social Security, and the state you live in never leave your device and are never sent to a server.
It is an educational estimate based on the numbers you enter and current federal and state tax law as modeled. Every federal figure is real output from the same tax engine behind Harbor's Roth conversion and Social Security calculators. It is not a substitute for advice from a qualified tax professional — verify any decision before acting.
Five questions the estimator is built to answer in detail, one per topic.
The tax estimator runs on the same whole-plan engine behind Harbor's Roth conversion and Social Security calculators — federal tax, state tax, IRMAA, and the taxable share of Social Security, computed together for your actual retirement income. Free, and your numbers never leave your device.
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