Import is the stage where the schedule of a deal most often slips. The reason is almost always the same: people come to customs with documents put together for the purchase, not for the clearance.
Rates, reliefs and conditions for aircraft have changed several times over the past few years. The only correct approach, therefore, is to check the applicable regime and the calculation of the payments as at the date of the particular deal, rather than relying on last year's experience. We do that calculation before the contract is signed, so that the figure does not come as a surprise after the ferry flight.
Three typical mistakes: misclassifying the aircraft, discrepancies between the seller's documents and what the clearance requires, and ferrying the aircraft in before the import regime is clear. The last is the most expensive: the aircraft is already in the country and the decision has still not been taken.
With the set of documents prepared in advance, weeks. Where there are discrepancies in the documents or the classification is disputed, it stretches into months, and the aircraft does not fly for the whole of that time.
Use is limited by the conditions of the regime. Before choosing a regime you need to understand exactly how you plan to fly — commercially or privately: both the regime and the risks follow from that.
No, and usually it is not worth it. The regime and the calculation of the payments are settled first, and the ferry flight is planned after that.
The declarant bears the responsibility. That is why preparing the documents and choosing the broker are not a formality but part of the deal.
Describe the situation — I answer personally and to the point.