Definition
The original value of an asset for tax purposes, usually the purchase price adjusted for stock splits, dividends, and return of capital distributions.
In Panel Profits
The exact acquisition cost paid by a collector for a physical comic or certified slab, including auction buyer's premium, shipping, and certification fees.
Comic-market example
Purchasing a CGC 8.0 Giant-Size X-Men #1 at auction for $3,600 hammer + $720 (20% buyer's premium) + $50 shipping establishes a verified Cost Basis of $4,370.00.
Calculation
Cost Basis = Purchase Hammer Price + Buyer's Premium + Shipping + Grading Fee
Common mistakes
Do not alter historical cost basis when market prices fluctuate.