British charity Oxfam has had to pay the Sri Lankan government $1m in import duty for vehicles used in tsunami reconstruction work.
Paperwork had kept the 25 four-wheel drive vehicles idle in the capital, Colombo, for a month.
The Sri Lankan government told the BBC News website the aid had been duty-free until the end of April but was now needed to prevent "market distortions".
Nearly 31,000 people died in Sri Lanka when the tsunami struck on 26 December.
Half a million were made homeless. :ph34r: