How to estimate customs duty before you travel

Customs duty is predictable if you know the rules. Before accepting sender packages on routes where duty thresholds are a factor, estimate your potential liability.

Step 1: Identify the destination country's duty-free threshold. This is the customs value below which no duty is owed. Examples: EUR 150 (EU), GBP 135 (UK), USD 800 (USA). Find the official figure from the destination country's customs authority website.

Step 2: Calculate the total customs value of all sender packages. Add up the declared values of every sender package you are carrying. If the total is below the threshold, you owe no duty.

Step 3: Identify duty rates for each category above threshold. If total declared value exceeds the threshold, you need category-specific duty rates. The EU publishes duty rates in its Combined Nomenclature tariff schedule.

Step 4: Calculate duty owed. Duty = (Customs value - threshold) x applicable duty rate. Then add VAT on top (in the EU: 20% typically applies to the customs value plus duty).

Step 5: Factor into your fee. If you regularly carry packages above thresholds and pay duty, this cost must be reflected in your per-kilogram fee.

Useful tools. The UK government's "Check Customs Tariff" tool and the EU's TARIC database both provide duty rates by commodity code.