As I noted in last week’s
post,
we are in the final stretch of 2025 income tax season and I am teaching a new
class called Income Taxes: Past, Present, and Future on April 15 as a
small part of the nationwide America 250 effort. Previously, I described past
history of income taxes in America.
This post discusses class
highlights relating to current income tax laws and policies.
Gross and Adjusted Gross
Income (AGI)- Under current law, taxpayers start out
with their gross (total) income from sources such as wages, dividends, taxable
interest, business income, alimony received, and required minimum distributions
from retirement plans. Adjustments to income, often referred to as “above the
line deductions,” include educator expenses, student loan interest, 50% of
self-employment tax, health insurance for self-employed workers, and retirement
plan contributions.
Individual Income Tax
Rates- The U.S. federal income tax system uses progressive
tax rates, meaning higher levels of income are taxed at higher percentages. As
of 2026, the tax brackets range from 10% to 37%. Each rate applies only to
income within its bracket, so taxpayers pay gradually higher rates as their
taxable income increases.
Long-Term Capital Gains-
Long-term capital gains are taxed at preferential rates of 0%, 15%, or 20%, depending
on taxable income and tax filing status. Long-term capital gains are calculated
by subtracting the cost basis (usually the initial purchase price plus additional
deposits such as reinvested dividends) from the selling price of an asset held
longer than one year.
Standard Deduction- The
standard deduction is a fixed amount that taxpayers can subtract from their AGI
before calculating federal income tax. It reduces taxable income without
requiring taxpayers to itemize individual deductions. For 2025 returns filed in
2026, the standard deduction is $15,750 for single filers, $31,500 for married
couples filing jointly, and $23,625 for heads of household. Taxpayers age 65 or
older or blind may claim an additional standard deduction amount.
Senior Tax Deductions- There
is an additional standard deduction available to taxpayers age 65 or older that
reduces taxable income beyond the regular standard deduction. For 2025 tax
returns, the extra deduction is $2,000 for single filers and $1,600 per
eligible spouse in married couples filing jointly. The bonus senior deduction
under the OBBBA tax bill is an additional temporary increase to the standard
deduction designed to reduce taxable income for income-eligible older adults.
Required Minimum
Distributions (RMDs)- RMDs originated with the creation of
individual retirement accounts in 1974. They are the minimum amounts that
retirees must withdraw each year from most tax-deferred retirement accounts,
such as traditional IRAs and employer savings plans. Under the SECURE 2.0 Act,
RMDs generally begin at age 73. The required withdrawal is calculated using IRS
life-expectancy tables based on age and account balance at the end of the
previous year.




