A tax write-off lowers your taxable income, which means you pay tax on less money
A tax write-off is an expense you subtract from your total income before the government calculates how much tax you owe. If you earned $50,000 and had $5,000 in write-offs, you would only pay tax on $45,000. The write-off itself does not give you money back — it just shrinks the pile of income that gets taxed.
Write-offs only help you if you itemize deductions on your tax return instead of taking the standard deduction. The standard deduction is a flat amount the IRS lets everyone subtract (for 2024, it is $14,600 for single filers and $29,200 for married couples filing jointly, though these amounts change yearly). If your write-offs add up to more than the standard deduction, itemizing saves you money. If they do not, you take the standard deduction and ignore the write-offs.
The amount you actually save depends on your tax bracket. If you are in the 22% bracket and have $1,000 in write-offs, you save roughly $220 in taxes. If you are in the 12% bracket, the same $1,000 saves you roughly $120. The higher your income bracket, the more each write-off is worth.
Key Takeaways
- A write-off reduces your taxable income, not your total tax bill — it makes the number the government taxes smaller.
- Write-offs only lower your taxes if they add up to more than the standard deduction, which is $14,600 for single filers in 2024.
- Common write-offs for individuals include mortgage interest, state and local taxes, charitable donations, and medical expenses above 7.5% of your income.
- Self-employed people and business owners can write off business expenses like equipment, supplies, and home office costs.
- You need receipts, invoices, or other proof for any write-off you claim, in case the IRS asks to see them.
Write-offs for homeowners and renters
If you own a home, you can write off the interest you pay on your mortgage (not the principal). You can also write off property taxes you pay to your state or county. These two deductions alone often add up to more than the standard deduction, which is why many homeowners itemize.
Renters cannot write off rent itself, but they may be able to write off property taxes if they pay them directly (this is rare). If you paid for home improvements that added value to a rental property you own, you cannot write those off in the year you paid — instead, you depreciate them over many years, which is a different process.
Medical expenses can be written off, but only the amount above 7.5% of your adjusted gross income. If your income is $60,000, you can only write off medical costs above $4,500. may be able to access expenses include doctor visits, prescription drugs, dental work, and health insurance premiums you paid yourself.
Write-offs for charitable giving and donations
Money you donate to may have access to charities — churches, nonprofits, schools, and similar organizations — can be written off. You need a receipt or written acknowledgment from the charity showing the amount and the date. The IRS publishes a searchable list of may have access to organizations on its website.
Donations of physical items (clothing, furniture, books) can also be written off, but you must estimate their fair market value and keep a list. If you donate a car, the rules are stricter — you generally can only write off what the charity sells it for, not what you think it is worth.
Donations to political campaigns, candidates, or political parties cannot be written off. Neither can donations to individuals, even if they are in need.
Write-offs for self-employed people and business owners
If you run a business or are self-employed, you can write off ordinary and necessary business expenses. This includes supplies, equipment, software, advertising, vehicle mileage (at the IRS standard rate, which changes yearly), and professional services like accounting or legal fees.
A home office can be written off if you use part of your home exclusively for business. You can deduct either a simplified amount ($5 per square foot, up to 300 square feet, for a maximum of $1,500 per year) or calculate your actual expenses — utilities, rent or mortgage interest, insurance, repairs — and deduct the percentage that corresponds to your office space.
Business meals and entertainment have strict rules. You can write off 50% of meal costs if you are discussing business, but only if you have documentation showing who attended, when, where, and what business was discussed. Entertainment expenses have become harder to write off in recent years.
State and local tax write-offs
You can write off state and local income taxes, sales taxes, or property taxes — but only up to $10,000 per year combined. This is called the SALT cap. If you live in a high-tax state and pay more than $10,000 in state and local taxes, you can only write off $10,000 of it.
You choose whether to write off income tax or sales tax, not both. Most people write off income tax because it is easier to track — it appears on your W-2 or your state tax return. If you paid sales tax on a large purchase like a car or boat, you can write that off instead, but you need to keep receipts.
What you need to keep for proof
The IRS does not require you to send receipts with your tax return, but you must keep them for at least three years in case the IRS asks. For charitable donations over $250, you need a written acknowledgment from the charity — a thank-you letter counts if it states the amount and whether you received anything in return.
For business expenses, keep invoices, receipts, credit card statements, or bank records showing what you bought, when, and how much you paid. For mileage, keep a log showing the date, distance, and business purpose of each trip (or use an app that tracks this automatically).
If you cannot find a receipt, the IRS may accept other proof — a credit card statement, a bank statement, or a written statement from you explaining what you bought and why. But having the original receipt is always safer.
When to itemize versus taking the standard deduction
Add up all your potential write-offs for the year. If the total is more than the standard deduction ($14,600 for single filers, $29,200 for married couples filing jointly in 2024), itemize on your tax return. If the total is less, take the standard deduction — it will save you more money.
Some people are close to the line and can benefit from bunching deductions into one year. For example, if you are planning to make a large charitable donation, you might donate in December of one year and skip donations the next year, so that one year you itemize and the other year you take the standard deduction.
If you are unsure whether to itemize, a tax professional can run the numbers for you. Many offer a free consultation to answer this question.
Frequently Asked Questions
Does a write-off give me money back?
No. A write-off reduces the income you pay tax on, which lowers your tax bill. If you owed $5,000 in taxes and a write-off saves you $500, you now owe $4,500. You do not receive the $500 as a refund unless you overpaid your taxes during the year.
Can I write off my car payment?
Not if you use the car for personal reasons. If you use it for business, you can write off either the actual expenses (gas, insurance, repairs, depreciation) or the standard mileage rate set by the IRS each year. You cannot write off the loan interest on a personal car.
What happens if I claim a write-off I am not supposed to?
If the IRS audits your return and finds a write-off that does not may have access to, they will disallow it and charge you back taxes plus interest. If the error was intentional, they may also charge penalties. This is why keeping receipts and understanding the rules matters.
Can I write off my internet bill if I work from home?
Only if you are self-employed or a business owner. If you are an employee, you cannot write off home office expenses, even if your employer requires you to work from home. Self-employed people can write off a portion of utilities and internet as part of their home office deduction.
Do I need to report write-offs on my tax return if I take the standard deduction?
No. If you take the standard deduction, you do not list individual write-offs on your return. The standard deduction is a single number you subtract from your income. Write-offs only appear on your return if you itemize.