Crossing into a higher bracket can never reduce your take-home pay. The higher rate applies only to the dollars above the line, and every dollar below it is taxed exactly as before. Bonuses often look punishing on the pay stub because of flat withholding, but withholding is a deposit and the real math happens on the return. Real income cliffs do exist, such as Medicare premium thresholds and certain credits, but they are tied to specific benefits rather than to brackets.

It is not an audit and it is not a bill. An IRS computer compared your return against the W-2s and 1099s filed under your Social Security number, found something missing, and proposed additional tax. It is frequently wrong, most often on stock sales, where the system may assume you paid nothing for shares and propose tax on the entire sale price rather than the gain. You generally have about thirty days to respond in writing with documentation, and you should not reflexively pay the number on the notice.

Three years covers most people, which is generally how long the IRS has to audit a return and how long you have to amend one. Massachusetts runs on a similar clock. A few things should be kept much longer: the returns themselves, records of what you paid for your home and every improvement receipt, investment purchase records, and documentation of nondeductible IRA contributions. Scanned copies are acceptable, so everything can fit on a flash drive.

The IRS tool at irs.gov tracks it with your Social Security number, filing status, and exact refund amount, and Massachusetts runs its own tracker through MassTaxConnect. Both update once a day overnight, so checking hourly accomplishes nothing. Most electronically filed refunds with direct deposit arrive within about three weeks; paper and amended returns take considerably longer. The IRS never texts or emails a refund link, so delete those.