What determines your refund size year to year

Your refund depends on how much tax you paid during the year versus how much you actually owe when you file. If you paid more than you owe, you get a refund. If you paid less, you owe money. The size of that refund shifts when your income changes, your filing status changes, the number of dependents you claim changes, or when tax law itself changes.

For 2026, the main thing that will affect most people is the standard deduction. This number increases most years to account for inflation. A higher standard deduction means less of your income is taxable, which can lower your tax bill and potentially increase your refund — but only if you don't also change how much you have withheld from your paychecks.

The other major factor is whether Congress extends, modifies, or lets expire the tax provisions that were set in the Tax Cuts and Jobs Act of 2017. Some of those provisions are scheduled to expire after 2025, which would change tax rates and deductions starting in 2026. Until Congress acts, you cannot know for certain what the 2026 tax code will look like.

Key Takeaways

  • The standard deduction typically increases each year for inflation, which can lower your taxable income and increase your refund if your withholding stays the same.
  • Tax law changes scheduled to take effect in 2026 are not yet finalized, so your refund could shift depending on what Congress does before the end of 2025.
  • Your refund size depends on the gap between what you paid in taxes during the year and what you actually owe, so changes to either side affect the result.
  • If your income, filing status, number of dependents, or job situation changes in 2026, your refund will likely change even if tax law stays the same.
  • Adjusting your W-4 withholding now can help you control whether you get a large refund or smaller one in 2026.

How inflation adjustments affect your refund

Each January, the IRS announces the standard deduction for the coming tax year, adjusted upward for inflation. For the 2025 tax year (filed in 2026), the standard deduction increased. For 2026 (filed in 2027), it will increase again, though the exact amount depends on inflation rates between now and then.

A higher standard deduction means you can earn more money before any of it becomes taxable. If your income stays flat and your withholding stays flat, a larger standard deduction should result in a smaller tax bill and a larger refund. But this only happens if you do not also increase the amount withheld from your paychecks.

The catch: most people do not adjust their W-4 when the standard deduction changes. If you left your withholding the same in 2025 and leave it the same in 2026, the inflation adjustment alone could push your refund up by a modest amount — usually between $50 and $200 for most filers, depending on income.

What could change about tax rates and deductions in 2026

The Tax Cuts and Jobs Act of 2017 set most individual income tax rates and deductions to expire after December 31, 2025. This includes the standard deduction amounts, the tax brackets themselves, and several other provisions. If Congress does not act, those provisions revert to what they were before 2017, which would mean lower standard deductions and higher tax rates across the board starting in 2026.

Congress may extend the current provisions, modify them, let them expire, or do something in between. Until that decision is made — which typically happens in late 2025 — you cannot know with certainty what your 2026 tax code will be. If the current provisions expire, most filers would owe more tax in 2026 and receive smaller refunds, all else being equal. If Congress extends them, your refund would be less affected by law changes.

This is why many financial advisors recommend waiting until late 2025 to make major decisions about withholding or estimated tax payments for 2026. The tax code you file under in 2026 may not be finalized until after you have already started earning income under it.

How changes to your personal situation affect refund size

Your refund also shifts when your life changes. If you get married, divorced, have a child, or lose a dependent in 2026, your filing status or number of dependents changes, which changes your tax bill. If you change jobs, get a raise, take a second job, or have a significant drop in income, your total tax owed changes. If you start claiming a credit you did not claim before — like the Earned Income Tax Credit or the Child Tax Credit — your refund can jump significantly.

The reverse is also true. If you claimed a dependent in 2025 but that person no longer qualifies in 2026, your tax bill goes up and your refund shrinks. If you had a major income increase, your refund may disappear entirely even if tax law does not change.

These personal changes usually have a much larger effect on your refund than inflation adjustments do. A child born in 2026 can add $2,000 to your refund through the Child Tax Credit alone. A job change that increases your income by $10,000 can reduce your refund by several hundred dollars.

The role of withholding in your 2026 refund

Your refund is not determined by tax law alone — it is determined by the gap between what you paid and what you owe. You control part of that gap by adjusting your W-4 form, which tells your employer how much tax to withhold from each paycheck.

If you want a larger refund in 2026, you can claim fewer allowances on your W-4, which increases withholding and means more money goes to the IRS during the year. If you want a smaller refund or to owe nothing, you can claim more allowances, which decreases withholding. Many people use their W-4 as a savings tool — deliberately overwithholding so they get a large refund, even though that means lending the government an interest-free loan all year.

If you made no changes to your W-4 in 2025 and make no changes in 2026, your withholding will stay the same. But your tax bill may change due to law changes or personal changes, which means your refund will change even though you did nothing.

Scenarios that would increase your 2026 refund

Your refund would likely be larger in 2026 if: Congress extends the current tax provisions and inflation pushes the standard deduction higher; your income stays flat or decreases; you claim a new dependent or become may be able to access for a new credit; you increase your W-4 withholding; or you have a major life change like marriage that shifts your filing status in a favorable way.

The most common scenario for a larger refund is straightforward that you did nothing and inflation did the work. If your income and withholding stayed the same, the standard deduction increase alone would lower your tax bill slightly, resulting in a slightly larger refund.

Scenarios that would decrease your 2026 refund

Your refund would likely be smaller in 2026 if: the current tax provisions expire and Congress does not extend them; your income increases; you lose a dependent or become ineligible for a credit you claimed in 2025; you decrease your W-4 withholding; or you have a major life change like divorce that shifts your filing status in an unfavorable way.

The most significant risk to your 2026 refund is the potential expiration of the 2017 tax provisions. If those expire and are not extended, the standard deduction would drop and tax rates would increase, meaning most filers would owe more tax and receive smaller refunds. This is the single largest unknown for 2026 refund planning.

Frequently Asked Questions

Should I change my W-4 now to get a bigger refund in 2026?

That depends on whether you want a large refund or prefer to keep more money in your paychecks throughout the year. A larger refund means you overwithhold, which is like giving the government an interest-free loan. Many people prefer to adjust their W-4 so their refund is small or zero, keeping more money in their pocket each month instead.

What happens if Congress lets the 2017 tax provisions expire?

If they expire and are not extended, the standard deduction would decrease and tax rates would increase starting in 2026. Most filers would owe more tax and receive smaller refunds. Congress typically decides this in late 2025, so the outcome will not be known until after the year has already started.

Can I predict my exact 2026 refund now?

No. You would need to know your 2026 income, filing status, dependents, and the final 2026 tax code — none of which are certain yet. You can estimate based on 2025 if nothing changes, but any change to your income, family situation, or tax law will shift the result.

Does the standard deduction increase every year?

Yes, it increases most years to account for inflation. The exact increase depends on inflation rates. The IRS announces the new standard deduction each January for the tax year that begins that same month.

If my income stays the same, will my refund stay the same?

Not necessarily. Even if your income and withholding stay the same, changes to tax law or your personal situation can change your refund. The standard deduction increase alone would lower your tax bill slightly, increasing your refund by a small amount.