Options Cost Basis Tracker
Every call you sell that expires worthless lowers what you effectively paid for the stock. This tracker keeps a running tally so you know your real cost basis — not what your broker shows.
When to Use This Calculator
I update mine after every single options cycle. Here's when it matters most:
- After each expired or closed option: Add the premium right away. Watching your cost basis drop $0.80, then another $1.10, then another $0.95 — that's what keeps you disciplined through boring weeks.
- Before picking your next covered call strike: You need to know your effective cost basis before you choose a strike. Sell below it and you're locking in a loss if you get called away. I won't do it.
- When you're thinking about closing early: Stock bounced back? Compare the current price to your effective cost basis. If you're sitting on a nice unrealized gain, sometimes it makes sense to take the profit and move on instead of grinding out another cycle.
- Tax time: Your adjusted cost basis matters for capital gains. Keep this updated and you'll thank yourself in April when you're reconciling brokerage statements.
How Cost Basis Tracking Works for the Wheel
Every time you sell a CSP or covered call and keep the premium, your effective cost basis drops. The stock doesn't even have to move. Your breakeven just gets lower and lower with each cycle. That's the whole engine of the wheel.
Real example: I bought 100 shares at $50.00. Collected $1.20/share from a CSP round, then $0.85/share from a covered call. My effective cost basis dropped from $50.00 to $47.95 — a 4.10% reduction. The stock could fall to $47.95 and I'd still break even. Two rounds in and I already had a $2.05 cushion.
Why Bother Tracking It?
Because this number drives every decision you make:
- Strike selection: You need to know your breakeven so you don't sell calls below it and lock in a loss.
- Downside protection: You can see exactly how much cushion your premiums have built. On some of my positions, collected premiums cover a 10%+ drop.
- Performance tracking: It's motivating. Watching that cost basis drop round after round keeps you in the game when the market is boring.
- Tax planning: Your adjusted cost basis determines your capital gains when you eventually sell. Keep clean records.
How to Use This Calculator
Enter your purchase price and number of shares. Then add each premium as a separate entry — label it something like “CSP Round 1” or “CC Round 2” and punch in the premium per share. The calculator shows your running cost basis, total premium collected, percentage reduction, and how the current stock price compares to your breakeven. Just keep adding entries after each cycle.
Key Formulas
Effective Cost Basis = Purchase Price − Total Premiums Collected
% Reduction = Total Premiums / Purchase Price × 100
Breakeven = Effective Cost Basis (stock must stay above this)
Total Premium Income = Σ (Premium per Share × Number of Shares)
Frequently Asked Questions
What's effective cost basis and why does it matter?
It's what you actually paid for the stock after subtracting every premium you've collected. Say you bought shares at $50 and pulled in $3.00 total from CSPs and covered calls. Your effective cost basis is $47.00. That's your real breakeven — not the $50 your broker shows. This number drives every decision you make on strike selection.
How do CSP premiums lower my cost basis before I even own shares?
Every CSP you sell and keep the premium on reduces what you'll effectively pay if you get assigned. I sold three rounds of puts on a stock at roughly $1.00/share each. When I finally got assigned, my effective purchase price was $3.00 less than the strike. That's $300 of built-in cushion on 100 shares before I even started selling covered calls.
Should I ever sell covered calls below my cost basis?
Almost never. If you sell a call below your cost basis and get called away, you're locking in a loss. I only do it when I want out of a position and I've accepted that I'm taking the L. Otherwise, always sell at or above your effective cost basis. That way if you get called away, you walk away with a profit.
Do collected premiums affect my taxes?
Yes, and it's not straightforward. Premiums from expired options are usually short-term capital gains. If you get assigned or called away, the premium adjusts the cost basis of your shares for tax purposes. I'm not a CPA — talk to one. But keep your premium records clean because you'll need them at tax time.
How many rounds of premium does it take to make a real difference?
On a $50 stock collecting $1.00-$1.50 per round, 3-5 rounds can drop your cost basis by 6-15%. That's meaningful. On a $200 stock where premiums are proportionally smaller, it takes more cycles. The whole point of this tracker is watching that number drop round after round. It's the most satisfying part of the wheel.
Options involve risk and are not suitable for all investors. All calculations are estimates — actual results will vary. Not financial advice. Full disclosure