Finance

Standard Deduction

A fixed amount that US taxpayers can subtract from their adjusted gross income instead of itemizing deductions. Most filers take the standard deduction since it is larger than their itemized total.

How standard deduction works

The mechanic:

  • Fixed amount subtracted from gross income.
  • Most US filers take the standard deduction.
  • Alternative — itemized deductions for filers whose specific deductions exceed standard.
  • Updates annually for inflation.

Simplifies tax filing for most people.

2025 amounts

For US federal taxes:

  • Single filer — $15,000.
  • Married filing jointly — $30,000.
  • Married filing separately — $15,000.
  • Head of household — $22,500.
  • Additional amounts for age 65+ or blind.

These doubled in 2017 with TCJA, making standard deduction more attractive than itemizing for most filers.

Standard vs. itemized

The choice:

  • Take standard if your itemized deductions are less than the standard amount.
  • Itemize if your specific deductions exceed standard.

Common itemized deductions:

  • Mortgage interest on primary residence.
  • State and local taxes (SALT) — capped at $10,000.
  • Charitable contributions.
  • Medical expenses above threshold.

For most filers post-2017, standard deduction is larger.

Why this matters

Several practical effects:

  • Simplifies filing — most filers don't need to track individual deductions.
  • Reduces audit risk — fewer specific claims to verify.
  • Affects tax planning — bunching deductions may help.
  • Affects charitable giving — donations don't reduce taxes if total itemized is less than standard.

Bunching strategy

For those near the threshold:

  • Bunch deductions into specific years.
  • Itemize that year, take standard the next.
  • Common applications — charitable giving, medical procedures.
  • Donor-advised funds facilitate charitable bunching.

This strategy can preserve tax benefits when itemized normally falls below standard.

What individuals should know

For most US filers:

  • Take standard unless you have meaningful specific deductions.
  • Calculate both before deciding (most tax software does this automatically).
  • Track expenses that might tip toward itemizing.
  • Consider bunching if near threshold.

Standard deduction represents one of the more meaningful 2017 tax-law changes. By doubling it, the legislation simplified filing for most Americans while reducing the impact of various itemized deductions.