Klarna does not charge interest for the Pay in full today, Pay in 30 days, and Pay in 4 plans.
The Pay over time financing plans range from 6-24 months with interest rates ranging from 0.00%-35.99% APR.
Read more in Klarna's Terms and Conditions.
You can find more information in the frequently asked questions on the Klarna website, by contacting customer support or by downloading the Klarna app.