People will have to pay 20 cents more when sending a standard letter within New Zealand from the start of July.
NZ Post announced this week that from July 1, the cost of sending a standard, medium-sized letter would increase from $1 to $1.20.
It said it was making the change, along with other changes to postal products, following an annual price review.
The price of sending a large letter would increase from $2 to $2.40 and an oversize letter would be $3.60 instead of $3.
There would also be product and price changes for business customers who use NZ Post's Bulk Mail products.