Germany’s solidarity tax, officially the solidarity surcharge (Solidaritätszuschlag), adds 5.5% on top of your assessed income tax or corporate tax. A 2021 reform raised the exemption thresholds so sharply that roughly 90% of individual taxpayers now owe nothing, but the surcharge still applies to high earners, every corporation subject to German corporate tax, and investment income taxed at Germany’s flat rate.1Federal Government of Germany. Solidarity Surcharge
Who Still Pays the Solidarity Surcharge
Before 2021, almost every German taxpayer paid the surcharge. The Act to Scale Down the Solidarity Surcharge, passed in December 2019, raised the exemption thresholds so far that most wage earners were lifted out of it starting with the 2021 tax year.2Federal Constitutional Court. Unsuccessful Constitutional Complaint Against the Solidarity Surcharge
For an individual filing separately, no surcharge is owed if the assessed income tax liability stays at or below roughly EUR 19,950, which corresponds to taxable income of about EUR 73,000. Married couples filing jointly get double that threshold, around EUR 39,900. Because these figures adjust periodically, confirm the exact number against the current year’s tax tables before relying on it.
The rate does not snap on all at once. Taxpayers whose income tax liability sits just above the exemption threshold move through a phase-in zone in which the surcharge rate climbs gradually up to the full 5.5%. Once liability is well past the threshold, the full 5.5% applies to the entire assessed income tax figure.
Corporations get no exemption at all. Every corporation subject to German corporate tax pays 5.5% on its full corporate tax liability, no matter its size.1Federal Government of Germany. Solidarity Surcharge A sole proprietor earning below the exemption threshold pays nothing, while an incorporated business with the same profits pays the surcharge on every euro of corporate tax owed.
Investment Income Is Treated Differently
Investment income catches many taxpayers off guard. Capital gains from selling shares, dividends, and interest income are subject to Germany’s flat 25% tax, and the solidarity surcharge applies to that flat tax with no exemption threshold. The combined effective rate on investment income works out to 26.375%, before any church tax.
The Federal Constitutional Court addressed this disparity in its 2025 ruling, finding that wage income and capital income taxed at the flat rate are “not essentially comparable situations,” which justified different exemption rules.2Federal Constitutional Court. Unsuccessful Constitutional Complaint Against the Solidarity Surcharge In practice, a taxpayer who owes zero surcharge on wages can still owe it on dividends or capital gains, because the flat tax mechanism withholds it automatically at the source.
One partial offset applies. Each taxpayer receives an annual investor’s allowance of EUR 1,000, doubled to EUR 2,000 for married couples filing jointly, which shelters that much investment income from any tax, including the surcharge. Beyond the allowance, the full 26.375% rate is withheld when a German financial institution processes the transaction.
How To Calculate the Surcharge
The surcharge is calculated on your assessed income tax, not on your taxable income.1Federal Government of Germany. Solidarity Surcharge You start with gross income, subtract deductions and allowances to reach taxable income, apply the income tax rate schedule to arrive at your income tax liability, and then apply 5.5% to that final tax figure.
Take an assessed income tax of EUR 30,000. If that amount is past the phase-in zone, you multiply EUR 30,000 by 5.5% to get a surcharge of EUR 1,650, making your total obligation EUR 31,650. A taxpayer with an assessed income tax of EUR 15,000 would owe zero, because that liability sits below the individual exemption threshold.
A quirk trips up parents. The base amount used for the surcharge is adjusted for child allowances even if you chose to receive child benefit payments (Kindergeld) instead. The tax office recalculates a hypothetical tax liability as if the child allowances had been applied, then uses that modified figure for the surcharge. The modified base can push some parents below the exemption threshold even when their actual income tax assessment sits above it.
Church members face an added layer. Church tax runs at 8% or 9% of assessed income tax depending on the federal state and is calculated on the same base as the surcharge. The two are independent, but together they can add a meaningful amount on top of the standard income tax bill.
How You Actually Pay It
Most taxpayers never file a separate form for the surcharge. Germany’s ELSTER electronic tax system calculates it automatically as part of the annual income tax return, and the tax office issues a single assessment notice covering income tax, solidarity surcharge, and church tax where applicable.3German Federal Central Tax Office. Tax Withholding Amount
Employees see the surcharge withheld from each paycheck alongside income tax and social contributions. Payroll systems apply 5.5% to the income tax portion of each pay period’s withholding, so nothing accumulates as a year-end surprise. Self-employed people and business owners pay the surcharge as part of the quarterly estimated tax installments the tax office sets from the prior year’s assessment.
When the annual return is processed, the tax office compares what was withheld or prepaid against the final surcharge liability. Overpayments are refunded alongside any income tax refund. Underpayments trigger a balance-due notice with a payment deadline printed on the assessment.
What Happens If You Pay Late
Missing a payment deadline on the surcharge carries the same penalty as missing any German tax payment. The late payment surcharge is 1% of the rounded-down unpaid amount for each month or partial month the payment remains outstanding.4Tax Office Baden-Württemberg. When Do Late Payment Penalties Apply and How Are They Calculated The unpaid figure is rounded down to the nearest EUR 50 before the 1% is applied. Penalties accrue automatically by operation of law once the deadline passes. There is no grace period, and the tax office has no discretion to waive them.
Is the Solidarity Surcharge Still Legal
Yes. The surcharge was originally created to fund the costs of reunifying East and West Germany after 1990, and critics have argued for years that reunification costs no longer justify a permanent surcharge. That argument reached Germany’s highest court in 2025, and the Federal Constitutional Court rejected the challenge.
The Second Senate ruled that it could not be determined that the additional financial needs arising from reunification had “evidently ceased to exist,” so the legislature was not required to abolish the surcharge.2Federal Constitutional Court. Unsuccessful Constitutional Complaint Against the Solidarity Surcharge The court acknowledged that a surtax must eventually end once its justifying need disappears, but gave parliament wide latitude in deciding when that moment arrives. Practically, the surcharge stays in force indefinitely until parliament votes to repeal it.
Cross-Border Considerations for U.S. Taxpayers
American citizens and residents earning income in Germany face both countries’ tax systems at once. The German solidarity surcharge is treated as a foreign income tax for U.S. purposes, so it generally qualifies for the foreign tax credit on your U.S. return. Claiming the credit reduces your U.S. tax dollar-for-dollar by the German tax you have already paid, including the surcharge, subject to the usual foreign tax credit limitations.
Americans living abroad may also need to file Form 8938 (Statement of Specified Foreign Financial Assets) if their foreign assets exceed the thresholds set for taxpayers living outside the United States:5Internal Revenue Service. Do I Need To File Form 8938, Statement of Specified Foreign Financial Assets
- Individual return: foreign assets exceed $200,000 on the last day of the tax year or $300,000 at any point during the year.
- Joint return: foreign assets exceed $400,000 on the last day of the tax year or $600,000 at any point during the year.
Form 8938 reports the existence and value of foreign financial accounts and assets. It does not create a separate tax liability, but failing to file when required triggers penalties starting at $10,000, with additional penalties if the omission continues after IRS notification. German bank accounts, brokerage accounts holding the investments subject to the surcharge, and interests in German business entities can each trigger the requirement. Taxpayers who already report a foreign asset on another form, such as Form 5471 for foreign corporations, can reference that form instead of duplicating the information, but must still identify it on Form 8938.