Few tax topics spark as much confusion as the difference between short-term and long-term capital gains. But the rules are actually simpler than they seem — especially once you know the thresholds that determine your rate.

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Long-term capital gains tax rates (US 2025): 0%, 15%, or 20% depending on taxable income ·
Tax-free threshold (single filer, US): Up to $48,350 for 0% rate ·
Additional net investment income tax: 3.8% on gains above $200,000 (single) / $250,000 (married) ·
Standard Irish CGT rate: 33% flat rate on most gains

Quick snapshot

1Confirmed facts
2What’s unclear
  • Future changes to tax brackets after 2025
  • State-level capital gains taxes in the US vary widely
  • Specific application of the 6-year rule (Australia) in individual rental scenarios
3Timeline signal
  • 2026 thresholds are already known: 0% rate up to $49,450 (single) CNBC
  • Ireland’s 33% rate is confirmed for 2026 Irish Tax Estimator
4What’s next
  • Taxpayers may want to harvest gains in 2025 while the 0% bracket is still relatively high
  • Cross-border investors should compare US and Irish rates carefully
Label Value
US long-term holding period More than 1 year
US 0% rate maximum income (single, 2025) $48,350
US top long-term rate (2025) 20% + 3.8% NIIT = 23.8% effective
Irish standard CGT rate 33%
Irish reduced rate (venture capital) 15%
Australian 6-year rule Exempts gains on former residence up to 6 years after moving out

What is capital gains tax?

Capital gains tax is a levy on the profit you make when you sell an asset — whether that’s stocks, real estate, or collectibles. The IRS Topic No. 409 states that nearly everything you own and use for personal or investment purposes is a capital asset. The key distinction in the US: how long you held it.

Short-term vs long-term capital gains

  • Short-term: assets held for one year or less, taxed as ordinary income (up to 37% in 2025).
  • Long-term: assets held for more than one year, taxed at preferential rates of 0%, 15%, or 20% (Fidelity).

The implication: holding an asset just one extra day can slash your tax rate by more than half.

Assets subject to capital gains tax

  • Stocks, bonds, mutual funds
  • Real estate (other than your primary residence, within limits)
  • Cryptocurrency — the IRS treats it as property
  • Collectibles (art, coins, antiques) — taxed at a maximum 28%

Ireland’s Citizens Information defines chargeable gains similarly, but applies a flat 33% rate regardless of holding period.

The catch

While the US rewards long-term holding with lower rates, Ireland’s 33% rate applies to both short- and long-term gains — making the holding period irrelevant for the tax rate itself.

Bottom line: US investors can cut their tax bill by holding assets past the one-year mark. Irish investors get no such discount no matter how long they wait.

Is long-term capital gains 15 or 20?

Both — and 0% as well. The actual rate depends entirely on your taxable income and filing status.

Current long-term capital gains tax rates by income bracket (2025)

Three brackets, one pattern: your rate is 0% for the lowest incomes, 15% for the middle, and 20% for the top earners. Here’s how they break down:

Filing status 0% rate up to 15% rate from 20% rate above
Single $48,350 $48,351 – $533,400 $533,401
Married filing jointly $96,700 $96,701 – $600,050 $600,051
Head of household $64,750 $64,751 – $566,700 $566,701

Source: IRS Topic No. 409

The pattern: if your income lands in the 0% bracket, you pay nothing on long-term gains — a powerful incentive for low-income years.

How the 3.8% net investment income tax affects the effective rate

High earners face an additional 3.8% Medicare surtax on the lesser of their net investment income or the amount by which their modified adjusted gross income exceeds $200,000 (single) or $250,000 (married) (High Earner Playbook). This pushes the effective top long-term rate to 23.8%.

Why this matters: a taxpayer in the 20% bracket with $300,000 in investment income could owe 23.8% on every dollar of gain — nearly a quarter of the profit.

Comparison: US vs Ireland long-term capital gains tax

Two countries, two philosophies. The US rewards long-term investing with a sliding scale; Ireland applies a single flat rate to all gains.

Feature United States Ireland
Standard long-term rate 0% / 15% / 20% (income-based) 33% flat
Holding period for lower rate More than 12 months No distinction (same rate for all periods)
Top effective rate (incl. surtax) 23.8% 33%
Primary residence exemption Up to $250,000 / $500,000 No general exemption (but reliefs available)
Tax-free threshold 0% bracket up to $48,350 (single) No equivalent; €1,270 annual exemption per person
Bottom line: The trade-off: US investors in lower brackets pay nothing, while Irish investors pay 33% on every euro of gain — but Ireland’s rate is simpler and doesn’t penalize short-term trades.

How much long-term capital gain is tax-free?

In the US, a significant amount of gain can be tax-free if you stay within the 0% bracket or use the primary residence exclusion.

Tax-free threshold: who qualifies for the 0% rate

  • Single filers with taxable income up to $48,350 (2025) pay 0% on long-term gains (IRS Topic No. 409).
  • Married couples filing jointly: up to $96,700.
  • Head of household: up to $64,750.

This means a single retiree with $50,000 in Social Security benefits and $30,000 in long-term gains could owe zero tax — provided total taxable income stays under the threshold.

Primary residence exclusion rules

The 2-out-of-5-year rule: if you’ve owned and lived in your home for at least two of the past five years, you can exclude up to $250,000 of gain ($500,000 for married couples) (Fidelity). This is one of the most generous tax breaks in the US code.

The upshot

For many homeowners, the gain on selling a primary residence is completely tax-free. The same cannot be said for investment properties or second homes.

Bottom line: A retiree or low-income investor can realize substantial gains and pay zero tax if total taxable income stays within the 0% bracket.

Who pays 0% long-term capital gains tax?

Anyone whose taxable income falls within the lowest bracket. That includes retirees, students, part-time workers, and investors who manage their income carefully.

Income limits for the 0% bracket

  • Single: taxable income ≤ $48,350 (2025).
  • Married filing jointly: ≤ $96,700.
  • Head of household: ≤ $64,750.

These thresholds are not indexed annually for inflation in the same way as ordinary income brackets — but the IRS adjusts them each year. For 2026, the 0% bracket rises to $49,450 for single filers (CNBC).

Strategies to stay within the 0% bracket

  • Harvest gains in years when your income is low (e.g., before starting Social Security).
  • Offset gains with capital losses (tax-loss harvesting).
  • Contribute to tax-deferred accounts to lower taxable income.

The pattern: timing your realizations can turn a 15% or 20% tax bill into zero.

How to avoid long term capital gains tax?

While you can’t always avoid the tax completely, several legitimate strategies can reduce or eliminate it.

Hold assets for more than one year to qualify for lower rates

This is the simplest move. The difference between short-term (ordinary income rates) and long-term (preferential rates) can be enormous — up to 17 percentage points for top earners (Fidelity).

Tax-loss harvesting to offset gains

Selling losing investments can offset gains dollar for dollar. If your losses exceed your gains, you can deduct up to $3,000 per year against ordinary income, and carry forward the rest (IRS Topic No. 409).

Use retirement accounts to defer or avoid taxes

Investing through IRAs and 401(k)s means you never pay capital gains tax on trades inside the account. You pay ordinary income tax on withdrawals instead — which can be lower if you’re in a lower bracket in retirement.

Gift appreciated assets to charity

Donating appreciated stock directly to a charity avoids capital gains tax and gives you a charitable deduction for the full market value. This is a favorite strategy for high-net-worth donors.

What to watch

The wash sale rule applies to losses on securities — you cannot claim a loss if you buy a substantially identical security within 30 days before or after the sale. This does not apply to gains, only to harvesting losses.

Bottom line: An investor who uses tax-loss harvesting and retirement accounts can significantly reduce or eliminate capital gains tax liabilities.

What is the 6 year rule for capital gains tax?

The 6-year rule is a specific exemption used in Australia and a few other countries, not the US. It allows homeowners to treat a former home as their main residence for up to six years after moving out, potentially exempting the capital gain.

How the 6-year rule applies to principal residence exemptions

  • If you move out of your home and rent it out, you can still claim it as your main residence for up to six years for CGT purposes.
  • This means no capital gains tax when you sell within that period, even if you’re living elsewhere.
  • After six years, the exemption ends and you’ll owe tax on the gain (unless you move back in).

Source: Australian Tax Office guidance as cited in Citizens Information (cross-reference).

Countries that use the 6-year rule: Australia and others

Australia is the primary jurisdiction with this rule. The US has a different approach: the 2-out-of-5-year use test for the primary residence exclusion. You must have lived in the home for at least two of the five years before the sale to qualify for the $250,000/$500,000 exclusion.

The catch: if you rent out your former home for more than three years, you may lose the US exclusion entirely. The 6-year rule is far more generous for landlords who later sell.

Bottom line: US investors should focus on the 0% bracket and primary residence exclusion. Irish investors face a flat 33% rate and may want to explore reliefs like the €1,270 annual exemption. For Australians, the 6-year rule offers a powerful way to avoid tax on a former home.
Additional sources

finance.yahoo.com, msn.com, finance.yahoo.com, taxfoundation.org, facebook.com, finbrief.space

Mis deze niet

Frequently asked questions

What is the holding period for long-term capital gains?

In the US, you must hold an asset for more than one year to qualify for long-term rates (Fidelity). Ireland does not distinguish between short- and long-term holding periods.

How do I report long-term capital gains on my tax return?

Use Schedule D (Form 1040) and the appropriate Form 8949 to list each sale. The IRS provides detailed instructions in Topic No. 409.

Can capital losses offset long-term capital gains?

Yes. Capital losses are first used to offset capital gains of the same type (long-term losses offset long-term gains, short-term offset short-term). Any excess can offset the other type, and up to $3,000 of net loss can be deducted against ordinary income annually.

What is the wash sale rule and does it apply to long-term gains?

The wash sale rule applies to losses: if you sell a security at a loss and buy a substantially identical security within 30 days before or after, the loss is disallowed. It does not affect gains. This rule is specific to securities, not real estate.

How are long-term capital gains taxed in Ireland?

Ireland applies a flat 33% capital gains tax on most chargeable gains, regardless of holding period. Certain assets like venture capital funds may qualify for a 15% rate (Citizens Information).

Are there any special rules for inherited assets?

In the US, inherited assets receive a “step-up in basis” to the fair market value at the date of death, meaning the capital gain from the original purchase price is erased. This is a major tax break for heirs.

What is the difference between realized and unrealized capital gains?

Realized gains occur when you actually sell the asset. Unrealized gains are paper profits on assets you still own. You only pay tax on realized gains.

Do I have to pay capital gains tax on cryptocurrency?

Yes, the IRS treats cryptocurrency as property. Selling or trading crypto triggers a taxable event. The same holding period rules apply: long-term if held for more than one year, short-term otherwise.

Nearly all assets you own and use for personal or investment purposes are capital assets.

— IRS Topic No. 409

Investments held for over a year are considered long-term, with a maximum 20% tax rate on the gains.

— Fidelity

The rate of CGT is 33% for most gains.

— Revenue Ireland

The standard rate of Capital Gains Tax is 33% of the taxable gain you make.

— Citizens Information

The bottom line for US investors: the 0% bracket is your best friend. For Irish investors, the 33% flat rate is unavoidable but manageable with careful planning. The choice is clear: understand your jurisdiction’s rules, time your sales, and use the exemptions available to you — or watch a third of your gains disappear to the taxman.