The 1921 census is part of their Premium subscription.  Unlimited access to the census can be purchased for a monthly fee of $19.99 or an annual fee of $239.99.

Pay-per-view

You can also view 1921 Census records on a pay-per-view basis using Findmypast micropayments. Viewing transcriptions costs $3.50 per record. Viewing images of the original records costs $4.90 US each. 12-month Ultimate British & Irish subscribers enjoy a 10% discount on all 1921 Census pay-per-view purchases.