AUCTION COST WORKSHEET
Guide: https://yenra.com/art-market/
Instructions: use the actual sale conditions and an itemized cost estimate.
Keep unknown amounts explicit. Premiums may be tiered and tax bases vary.
The simplified example below is arithmetic practice, not an auction quote.

Lot / sale / date / currency:
Catalog URL and saved description:
Conditions version / source:
Hammer ceiling:
Premium schedule and calculated premium:
Applicable tax basis / rate / amount (confirm for this transaction):
Other fees or royalties:
Shipping / insurance / storage:
Total acquisition cost:
Unknown items and contingency:
Permitted bid increments:

HYPOTHETICAL FLAT-RATE EXAMPLE
Hammer H = $4,000
Premium p = 25% of hammer: $1,000
Fictional tax t = 8% of hammer + premium: $400
Shipping S = $200
No other charges assumed.
Total = H*(1+p)*(1+t)+S = $5,600
For a $5,000 total budget in THIS MODEL:
H = (5000-200)/(1.25*1.08) = about $3,555.56
Round down to an allowed increment; allow for unresolved costs.

COMPARABLE LOT RECORD - duplicate per lot
Maker / attribution / title / date / medium / dimensions / edition:
Condition / provenance notes:
Sale date / location / currency:
Sold, unsold or withdrawn:
Reported price and whether premium is included:
Comparison limits: