Know the complete cost basis of every sports card you own.

Start with the agreed purchase price, sales tax, buyer fees, and inbound shipping. For a multi-card purchase, allocate shared costs using one documented method, such as each card’s share of the purchase price.

Keep the purchase date and source with the cost. That makes the record understandable when the original listing or receipt is no longer available.

A grading order can include service fees, optional services, supplies, outbound shipping, insurance, and return shipping. Allocate shared order costs across the submitted cards consistently. Record later upcharges when they occur instead of overwriting the original estimate.

If a card is cracked, crossed over, or resubmitted, retain each grading expense. The prior attempt still consumed money even if the label changed.

Cost basis describes the investment carried into the sale. Marketplace fees, payment processing, promoted-listing fees, and shipping to the buyer are usually recorded when the sale occurs. Keeping those fields separate makes both gross margin and net proceeds transparent.

Tax treatment depends on facts and jurisdiction. This operational guide is not tax advice; use an appropriate professional for tax reporting decisions.

When the card sells, subtract cost basis and sale expenses from sale proceeds. Do not replace historical cost with the most recent market estimate. Estimated value helps manage the collection; realized profit measures the completed outcome.

Preserve the inputs behind the result so a future review can explain the number without reconstructing the transaction from memory.