There's a fee — but it's capped
Banks charge an early-settlement (prepayment) fee when you pay off a mortgage ahead of schedule. The UAE Central Bank caps this fee — broadly 1% of the outstanding balance, up to a maximum of AED 10,000 — so it can't be open-ended. Confirm your bank's exact charge in the offer letter.
Partial overpayments
Many mortgages let you overpay a portion each year (often up to a set percentage) without penalty, shortening the term or reducing future interest. Beyond that allowance, the early-settlement fee can apply. Check your product's overpayment terms.
Settling on a sale
When you sell, the buyer's funds clear your outstanding balance and the bank issues a liability letter / its own NOC. The mortgage is then released at the DLD before (or as part of) the transfer to the new owner.
Releasing the mortgage at the DLD
Once the loan is settled the bank provides a clearance/release letter; the mortgage is de-registered against the title deed at the DLD. Only then is the property unencumbered. Build this step into a sale or refinance timeline.