What if I have more than one job?+
Withholding usually under-collects across jobs, because each employer withholds as though its salary were your only income. The tax withholding reconciliation calculator is the place to check the total.
How do I add extra withholding?+
In the US, a fixed dollar amount per pay period goes on the extra withholding line of your W-4. That is exactly what the extra field here models.
Should I aim for a big refund?+
A large refund is an interest-free loan to the government. Aiming close to zero keeps the money in your cheques, as long as you will not spend the difference and come up short.
How much should I have withheld from my paycheck?+
Enough that total withholding for the year lands near your actual tax liability. A common starting point is your effective tax rate from last year's return, adjusted for any big changes.
Why did my withholding change mid-year?+
Employers adjust withholding when you file a new W-4, get a raise or bonus, or when annual withholding tables change. Bonuses are often withheld at a flat 22% supplemental rate, which is another reason the figure moves.
What happens if I do not withhold enough?+
You may owe the balance at filing, plus interest and possibly a penalty. The IRS safe harbor is usually met when withholding covers at least 90% of this year's tax or 100% of last year's.
Are these numbers financial advice?+
No. They are educational estimates based on the inputs and assumptions on this page. Confirm important decisions with a qualified professional and your own documents.