Tax Guide

Marginal rates apply slice by slice. If you sit in the 22% bracket, only the dollars above that bracket's threshold are taxed at 22%; everything below is taxed at the lower rates that came before. Your effective rate — total tax divided by total income — is therefore always lower than your top marginal rate.

The thresholds move every year. The IRS publishes inflation adjustments for brackets, the standard deduction and dozens of other limits in an annual revenue procedure, and those figures are the only ones we use on this site.

Tax is charged on taxable income, not on gross pay. Pre-tax retirement contributions, health premiums paid through an employer plan and health savings account contributions come off first, then either the standard deduction or your itemised deductions.

That is why two people earning the same salary can owe very different amounts. Modelling the deductions before the year ends is usually worth more than any filing trick applied in April.

Your employer withholds tax based on the W-4 on file. A large refund means you lent money to the Treasury interest-free all year; a large balance due can trigger an underpayment penalty. Both are withholding problems, not tax problems.

Recheck your W-4 whenever your household changes: a second job, a spouse starting work, a bonus, a new child, or a move to another state.

A deduction lowers the income being taxed, so its value depends on your marginal rate. A credit lowers the tax itself dollar for dollar, and some credits are refundable, meaning they can pay out beyond your liability.

For most households the biggest lever is not an exotic deduction but the ordinary ones done properly: retirement contributions, education credits, dependent care and, for homeowners, mortgage interest and property tax when itemising beats the standard deduction.

Assets held longer than a year are taxed at long-term capital gains rates, which sit below ordinary income rates for most filers. Held a year or less, the same gain is taxed as ordinary income.

Placement matters as much as selection: interest-heavy holdings are usually better inside a tax-deferred account, while long-term equity holdings can be efficient in a taxable one.

Several states levy no broad personal income tax, and others apply flat or progressive schedules on top of the federal bill. Property and sales tax often move in the opposite direction, so a low-income-tax state is not automatically a cheap state.

Our state pages combine income, property and cost data so the comparison is made on total burden rather than on a headline rate.

Most straightforward returns — W-2 income, standard deduction, common credits — can be filed with consumer software, and several products file simple federal returns at no cost. Complexity, not income, is what justifies paying: self-employment, rental property, equity compensation, multi-state work or a business return.

We keep vendor pricing on separate review pages because tax software prices change every filing season and rise as the deadline approaches.

Tax outcomes are decided during the year, not in April. Four checkpoints cover most of it.