What Is Cost Basis?
Cost basis is the total amount you paid for an investment, including any fees or premiums. For precious metals, your cost basis is the purchase price of your coins or bars — not the spot price at the time you bought them.
The difference between spot value and cost basis is important: you may have paid a 10% premium over spot when you bought a coin. If spot rises 10%, you're only breaking even in terms of cost — not actually profitable yet.
Why Cost Basis Matters for Bullion
The IRS treats precious metals as collectibles, not currency. When you sell:
- Gains are taxable. Long-term capital gains on collectibles are taxed at a maximum 28% rate (higher than standard long-term rates).
- Your gain or loss is calculated as: Sale Price − Cost Basis.
- If you can't document your cost basis, the IRS may assume it is zero — meaning you owe tax on the full sale price.
Keeping accurate records is not optional. A simple spreadsheet or inventory tool can save you significant money and headaches at tax time.
How to Calculate Your True Cost Per Ounce
Your true cost per ounce is more meaningful than the face value or even the spot price at time of purchase. It tells you exactly what you need spot to reach before you're actually profitable.
True Cost Per Ozt = Total Paid / Total Pure Metal Ounces
Example:
You buy $20 face value of 90% quarters (= 14.468 ozt silver) for $560.
True cost per ozt = $560 / 14.468 = $38.70/ozt
Silver spot is $32.00. You need spot to rise to $38.70 to break even.
Tracking Multiple Purchases Over Time
Most stackers make many purchases over time at different spot prices. Your effective cost basis is the weighted average across all purchases:
Average Cost = Sum of All Purchase Prices / Total Pure Ounces Held
Dollar-cost averaging (DCA) is a common strategy: buying a fixed dollar amount at regular intervals regardless of spot price. Over time, this reduces the impact of timing the market. Tracking your running average cost shows whether your DCA strategy is lowering your effective cost basis.
What to Record for Each Purchase
For each coin purchase, record:
- Purchase date — required for determining holding period (short-term vs. long-term capital gains)
- Coin types and quantities — specific denomination and series
- Total price paid — including any premiums, shipping, or transaction fees
- Silver/gold spot price at time of purchase — useful context for measuring your entry point
- Total pure metal ounces — so you can calculate effective cost per ounce
- Where purchased — dealer, coin show, private sale (relevant for any disputes)
Tools for Tracking Your Stack
A spreadsheet works but becomes unwieldy as your stack grows. Purpose-built inventory tools offer several advantages:
- Automatic melt value calculation against live spot prices
- Per-lot and aggregate P&L tracking
- Filtering by date range and sorting by value or premium
- Export to CSV for tax software or your accountant
- Print reports for insurance documentation
BullionAssistant's inventory tracker does all of this. When you evaluate a deal in the calculator, you can save it directly to your inventory with one click. Every purchase is logged with the coin breakdown, price paid, and purchase date.
Selling: Calculating Realized Gains
When you sell, your realized gain or loss is straightforward:
Realized Gain = Sale Price − Cost Basis
If you bought a lot of junk silver for $560 and sold it for $720, your realized gain is $160. That gain may be subject to collectibles capital gains tax depending on your holding period and jurisdiction.
Important: Tax rules for precious metals vary by country and change over time. Always consult a qualified tax advisor for your specific situation.