Half price, and the ceiling is higher than people assume
USCIS charges $760 for a paper Form N-400. But if your documented household income is at or below 400% of the Federal Poverty Guidelines, the fee drops to $380.
Many applicants dismiss this assuming it is for extreme poverty. It is not. 400% is a high ceiling: for a single-person household it sits around $63,840 a year, and for a household of four it exceeds $130,000. A large share of applicants qualify without realizing it.
How it is calculated
Take the Federal Poverty Guideline for your household size and multiply by four. If your documented annual household income is equal to or below that figure, you qualify. Alaska and Hawaii have their own, higher tables.
The strict part: documentation
The operative word is documented. Stating your income is not enough — you must submit evidence with the application: tax returns, pay stubs, or benefit statements. A reduced-fee request without supporting evidence is rejected and the full fee is demanded.
It has to be on paper
Here is the detail that costs people money: the reduced fee cannot be requested online. File your N-400 through the online system and you pay $710 with no way to apply the discount. To pay $380, the form must go on paper.
Do not confuse it with the waiver
Two different things. The reduced fee lowers payment to $380 at a 400% threshold. The waiver, via Form I-912, eliminates payment entirely, but its threshold is 150% — far harder to meet. If you qualify for the waiver, take that instead.