It's the key question for Belfast's landlord and buy-to-let property investors.
So we've created a 'cut-out-and-keep' guide that you can use again and again to answer this question - the exclusive, at-a-glance Belfast Property Blog rental yield calculator.
This ingenious little tool is the perfect complement to our quarterly market report analysis.
Armed with the latest sales and pricing trends, landlords can use it to work out just how much money your next buy-to-let investment will earn for you.
We'd love to know what you think of the rental yield calculator - let us know if it helped you, and if you have suggestions for other handy tools and guides you'd like to see.