Research · Updated October 23, 2026 · by Arun

AI PDF form filling benchmark: government forms filled on a Mac

How fast, and how much, can AI fill on government PDF forms when it runs on your own Mac? We recorded a run for every built-in form in Fyllyo: 47 forms, each filled from a test client’s documents.

The numbers

Totals across the recorded runs
Measure	Result
Forms filled	47
Fields filled, in total	1,673
Fields filled per form, on average	36
Documents read, in total	312
Time per form, median	19 seconds
Time per form, slowest	64 seconds
Documents uploaded	None

How we ran it

Test clients only. Each form has its own test client: made-up people and businesses with a realistic set of papers, such as returns, W-2s, statements, letters, emails, notes and worksheets.
On a Mac. Fyllyo reads the documents and fills the form with AI that runs on the Mac. Nothing was uploaded.
The time runs from choosing Fill the form to the filled PDF, with the documents already added.
The count is the fields Fyllyo filled itself. Fields it left for the preparer, with the reason, aren’t counted.

Each form’s page describes its run, its documents and what Fyllyo left blank.

Every form

Recorded run for each form
Form	Category	Documents	Filled	Seconds
Form 941-X	Tax forms	6	70 fields	29
Form 1040-X	Tax forms	4	46 fields	27
Form 1099-C	Tax forms	7	13 fields	9
Form 1099-G	Tax forms	4	30 fields	14
Form 1099-K	Tax forms	8	72 fields	27
Form 1099-OID	Tax forms	5	30 fields	12
Form 1099-PATR	Tax forms	7	13 fields	43
Form 1099-Q	Tax forms	7	16 fields	19
Form 1099-S	Tax forms	6	9 fields	8
Form 1120-S	Tax forms	7	112 fields	64
Form 2553	Tax forms	6	28 fields	23
Form 4868	Tax forms	4	9 fields	14
Form 5329	Tax forms	8	19 fields	40
Form 5498	Tax forms	8	13 fields	14
Form 5695	Tax forms	7	37 fields	15
Form 8288	Tax forms	7	13 fields	21
Form 8832	Tax forms	6	14 fields	12
Form 8889	Tax forms	9	16 fields	29
Form 8949	Tax forms	5	38 fields	19
Form W-2	Tax forms	7	115 fields	24
Form W-4P	Tax forms	8	23 fields	22
Schedule 1 (Form 1040)	Tax forms	10	10 lines	29
Schedule C (Form 1040)	Tax forms	5	50 fields	30
W-9	Tax forms	6	7 fields	7
Form DS-11	Immigration and passport forms	7	61 fields	19
Form DS-82	Immigration and passport forms	6	51 fields	15
Form DS-5507	Immigration and passport forms	10	28 fields	18
Form I-140	Immigration and passport forms	12	105 fields	39
Form I-193	Immigration and passport forms	7	22 fields	11
Form I-508	Immigration and passport forms	7	36 fields	13
Form I-864	Immigration and passport forms	7	54 fields	26
Form 12.901(b)(3)	Court forms	6	25 fields	10
Form CIV-GP-124	Court forms	7	21 fields	13
Form E	Court forms	4	13 fields	5
Form UCS-840	Court forms	8	33 fields	19
Form UCS-840C	Court forms	5	8 fields	27
Motion for Poor Person Relief	Court forms	7	36 fields	25
Notice of Confidential Information within Court Filing	Court forms	5	14 fields	9
Summons (New York Supreme Court)	Court forms	7	13 fields	9
Form CMS L564	Medicare and Social Security forms	4	18 fields	10
Form CMS-1500	Medicare and Social Security forms	7	113 fields	46
Form SSA-44	Medicare and Social Security forms	5	12 fields	6
Form SSA-455	Medicare and Social Security forms	7	23 fields	17
ACORD 25	Employment and business forms	9	56 fields	52
Form 69-001	Employment and business forms	7	65 fields	37
Form I-9	Employment and business forms	6	32 fields	15
Form WH-380-E	Employment and business forms	5	31 fields	19

Blanks, not guesses

Speed only matters if the answers are right. When the documents disagree, or a figure is missing, Fyllyo leaves the field empty and says why, rather than picking one. On Form 1040-X, for example, it filled 46 fields from four documents and left a line for the preparer because two documents gave different amounts, 88,750 and 88,570.

Using these numbers

You’re welcome to cite these results with a link to this page. The table updates as we add forms and re-run them, so the date at the top is when it last changed.

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