GainsKeeper vs Form8949.com in 2026: Year-Round Basis Tracking or One-Time Filing?
GainsKeeper is a subscription that watches your positions all year, adjusting basis for wash sales and corporate actions, priced from about $59 annually for 150 transactions up to $659 for its highest tier, and frequently bundled free inside a brokerage account. Form8949.com charges only when you file, starting around $18 for one broker file with 900 transactions included, and it explicitly does not redo the wash sale accounting your broker already performed. So the real choice is whether you need the math done or only the paperwork done.
Scored head to head
| Criteria | GainsKeeper | Form8949.com | TXF Converter |
|---|---|---|---|
| Accuracy | 9.5 | 8.5 | 8.0 |
| Format / TXF support | 8.0 | 9.0 | 9.5 |
| Ease | 6.5 | 8.0 | 9.5 |
| Speed | 7.0 | 8.0 | 9.5 |
| Price | 5.5 | 7.0 | 10.0 |
| Privacy | 7.5 | 7.0 | 9.5 |
| Overall | 7.6 | 8.1 | 9.2 |
Scores from our full 2026 comparison, out of 10. Between the two, Form8949.com scores higher overall.
Pick GainsKeeper if
Pick GainsKeeper if you want adjusted basis maintained continuously rather than reconstructed in April, especially for corporate actions like splits, spinoffs, and mergers that are painful to reconstruct later. It is close to a default if your broker includes it, though be aware some broker feeds only pull about 90 days of history, so it works best when you keep it current during the year rather than switching it on at tax time.
Price: ~Annual subscription (as of 2026)
Pick Form8949.com if
Pick Form8949.com if you file once a year, your 1099-B numbers look right, and you want finished output fast. It supports over 100 broker formats, accepts CSV, XLS, PDF, XML, JSON, and TXF, consolidates multiple accounts into one Form 8949, and its per-transaction overage rates drop sharply at volume, so it stays inexpensive even on very large accounts.
Price: ~Tiered per transaction count (as of 2026)
The bottom line
GainsKeeper is buying accuracy in the numbers and Form8949.com is buying convenience in the output, and most filers with a clean consolidated 1099-B genuinely do not need the former. The exception is anyone whose basis is unreliable, holding through corporate actions or trading the same names repeatedly, where paying only at filing time means filing whatever your broker got wrong. If all you actually need is your broker's already-correct trades carried into TurboTax desktop, our free TXF Converter does that conversion, TXF plus a Form 8949 CSV, without a subscription or a per-file charge.
- ✓Free to try, no signup
- ✓Outputs TXF for TurboTax desktop plus a Form 8949 CSV
- ✓Reads any broker — foreign and small platforms included
- ✓Files processed in-memory and deleted after conversion
Free, no signup. Or see the full ranking of all 6 tools.