QastLedger
Contract-by-contract P&L
Every buy and sell is matched into a position, then gross P&L, fees and net gain or loss are shown on their own line. No black-box totals.
For Kalshi & Polymarket traders
Every contract. Every fee. Tax-ready.
QastLedger pulls your full trade history, calculates P&L contract by contract with fees stripped out, and builds the Form 6781 and Form 8949 your accountant actually needs.
Free to start. Read-only access. We never see a private key.
Closed positions · 2026
Example data
| Market | Treatment | Net P&L |
|---|---|---|
Fed cuts rates in December Kalshi | 60/40 | +$412.30 |
NYC high above 90°F on Jul 14 Kalshi | 60/40 | −$46.60 |
Super Bowl LXI winner Polymarket | Short-term | +$1,208.00 |
CPI YoY above 3.0% in August Kalshi | 60/40 | +$88.15 |
Fees removed$31.42
Form 6781+$453.85
Form 8949+$1,208.00
Pulls history straight from the source, or from any spreadsheet.
Kalshi API
Polymarket wallet address
Anything else CSV import
What you get
Built for how prediction markets are actually taxed
Generic crypto and stock tools don't understand event contracts. QastLedger was built for them from day one.
Your call on tax treatment
Kalshi positions get Section 1256 60/40 treatment, matching Kalshi's own tax statement. For Polymarket, you choose: 60/40, or short-term and long-term based on how long you held each position.
IRS forms, filled in
Download a tax report with the IRS forms already filled in, including open positions marked to market at year end.
- Form 6781
- Form 8949
- Schedule D
Insights that save you money
See where you're actually making money, and get alerts before a holding period or a tax deadline costs you.
- Win rate
- Profit factor
- Daily P&L calendar
- Tax-loss harvesting
- Quarterly estimates
Section 1256 contracts
Why 60/40 matters
Gains on regulated event contracts can be taxed as 60% long-term and 40% short-term, no matter how long you held them. That can mean a meaningfully lower tax bill than treating everything as short-term, and most tax tools won't split it for you.
Taxed at long-term rates$6,000
Taxed at short-term rates$4,000
Illustration only. Whether a position qualifies depends on the contract and your situation, so confirm with a tax professional.
How it works
From trade history to tax forms in minutes
Connect your accounts
Add a read-only Kalshi API key, paste your public Polymarket wallet address, or upload a CSV. We never ask for a private key or seed phrase.
Review your positions
Every closed contract is listed with fees removed. Choose how your Polymarket trades are treated, or keep the default.
Download your report
Get Form 6781, Form 8949 and Schedule D as a PDF, ready to hand to your accountant or import into your tax software.
Pricing
Pay once for tax season, or go Pro all year
Free
See your real P&L across every platform.
$0forever
Start free
- Connect Kalshi, Polymarket and CSV
- Full trade history
- Contract-by-contract P&L
- Basic dashboard
Tax Report
Everything you need to file, for one tax year.
$70per tax year
Get my report
- Everything in Free
- Form 6781, Form 8949 and Schedule D
- 60/40 or holding-period treatment for Polymarket
- One-time payment, no subscription
Pro
Best valueTax reports plus year-round insights for active traders.
$89per year
Go Pro
- Everything in Tax Report
- Win rate, profit factor and P&L calendar
- Holding-period and tax-loss harvesting alerts
- Quarterly estimated tax helper
FAQ
Questions traders ask us
Is it safe to connect my accounts?
Yes. For Kalshi we use a read-only API key, which can view history but can't place trades or move money. For Polymarket we only need your public wallet address. We will never ask for a private key or seed phrase.
Are Kalshi contracts really taxed as 60/40?
Kalshi is a CFTC-regulated exchange, and its own year-end tax statement reports contracts as Section 1256 contracts with 60/40 treatment. QastLedger applies the same treatment. Tax rules for event contracts are still evolving, so confirm with a tax professional.
What about Polymarket?
Polymarket's main international platform isn't a CFTC-regulated exchange, so it may not qualify for 60/40 treatment. You choose how QastLedger treats your Polymarket trades: short-term or long-term based on how long you held each position, or the 60/40 split if you and your advisor decide it applies.
Can I import trades from another platform?
Yes. Upload a CSV with market, open date, close date, quantity, gross P&L and fees. We accept common column names and date formats, and flag any rows we can't read.
Do I need Pro to get my tax forms?
No. The one-time Tax Report covers everything you need to file for a single year. Pro adds year-round insights and includes tax reports.
How do I contact you?
Email us at [email protected]. A real person reads every message, and we usually reply within one business day.
Resources
Guides to prediction market taxes
How to Give Your CPA Your Prediction Market Trades: A Checklist
Everything your tax preparer needs to report your Kalshi and Polymarket trading correctly, in one checklist, so you don't pay for extra hours of back-and-forth.
How to Enter Form 6781 in Tax Software
Filing your own return? Here's how to find the Section 1256 section in most tax software, what numbers to enter, and how to check the result before you file.
Form 6781 vs. Form 8949: Where Prediction Market Trades Go on Your Return
Which IRS forms Kalshi and Polymarket traders need, what goes on each one, and how they all come together on Schedule D.
Know your real number before tax season.
Connect an account in under two minutes. Free to start.