The return leg.

Decide the policy before the shopping

Everything in this guide comes down to one habit. Before a family buys anything substantial abroad, somebody should have looked at the current allowance and declaration rules and decided how the item will come home: in the suitcase and declared, in the suitcase within the allowance, or shipped by a licensed freight agent with a proper export and import declaration. Making that decision in the shop takes two minutes. Making it in the arrivals hall takes an hour, sometimes considerably more, and occasionally costs the item.

The second habit is documentary. Keep every receipt, certificate and refund form together in one envelope for the whole trip, photograph the significant items, and do not throw away the box. A customs officer assessing value works from what you can show, and a family that can produce an itemised receipt for a watch is in an entirely different conversation from a family that cannot.

How the allowance regime works, in outline

China Customs, the General Administration of Customs, operates a duty-free allowance for articles brought in by travellers for personal use, with a stated value ceiling for residents returning from abroad and a separate, larger arrangement covering purchases made at duty-free shops on entry. Above those ceilings, goods are dutiable and a schedule of rates applies by category, with luxury categories such as high-value watches and jewellery attracting the higher rates. A single indivisible article whose value exceeds the ceiling is generally dealt with as a whole rather than partly relieved. Allowances attach to the individual traveller, and they exist for personal use rather than for goods being brought in to sell.

We are deliberately not printing the figures. They have changed before, the categories and rate schedules are revised, and the last thing a family needs is to plan a purchase against a number they read on a website in a year when it was different. Look up the current allowance, the current parcel tax rates and the current declaration thresholds on the General Administration of Customs website, or ask at the customs desk before you fly, and do it in the week you are travelling. Anyone who tells you the number confidently from memory is guessing.

Declaring: the two channels

Chinese airports operate the standard red and green channel system, with an entry declaration form where one is required. The green channel is a declaration in itself: walking through it states that you have nothing above the allowance and nothing restricted. If you are carrying goods above the allowance, currency above the declarable amount, restricted items, or anything you are not sure about, use the red channel and say so. Officers deal with declared goods routinely and briskly. The penalty regime exists for the undeclared.

Two practical points. Customs is entitled to inspect and increasingly uses scanning at the arrivals belt rather than only at the channel, so the choice of channel is not the only checkpoint. And an item worn on the wrist or the finger is still an imported article; the belief that jewellery and watches are exempt because they are being worn is one of the most persistent and most expensive misunderstandings in travel.

The categories that need care

• Gold and jewellery. Thai gold is a genuine buy but it is a high-value import; know the position before buying in quantity, keep the shop's receipt showing weight and purity, and declare where required.
• Watches and luxury goods. These fall in the higher duty categories, and valuation without a receipt is done by the officer rather than by you.
• Gemstones. Carry the independent laboratory certificate with the stone and the itemised receipt with both. Loose stones attract attention and should be declared.
• Ivory, tortoiseshell, coral, certain shells, reptile skins, rosewood and other protected species products. These are restricted or prohibited under CITES and by both Thai and Chinese law, penalties are severe, and a market seller's assurance is worthless.
• Counterfeits. Seizure and penalties apply on the China side, and there is no version of this that is worth the saving.
• Food, plants, seeds, fresh fruit and any meat or dairy product. Agricultural and animal products face import controls in both directions; the durian in the hand luggage is a genuinely common problem.
• Medicines. Traditional preparations and prescription drugs both have rules; carry original packaging and prescriptions, and check controlled substances before travel.
• Anything bought for someone else in commercial quantity. Repeated identical items read as trade rather than personal use, and are treated accordingly.

Currency, and the only acceptable approach

Cross-border movement of money is governed by rules on both sides and there is exactly one correct approach: use lawful, documented channels and declare what the rules require you to declare. Cash carried above the published thresholds must be declared on entry and exit, in both directions. Foreign exchange purchased in the mainland is governed by the arrangements administered by the State Administration of Foreign Exchange, and your bank will tell you precisely what applies to you and what documentation a larger transfer needs. Payments for a property, a school fee or a substantial purchase belong in a bank transfer with a purpose stated and a paper trail, not in a suitcase and not through an intermediary offering to help.

Our office will not advise on anything else, and we would treat any adviser who volunteers a workaround as a reason to end the relationship. The families who have trouble in this area are never the ones who moved money slowly and openly through a bank.

Before you leave Thailand

The Thai side has its own short list. If you are claiming the tourist VAT refund, the goods must still be with you and unused, the paperwork must have been issued in the shop at purchase, and high-value items usually need to be presented to customs before check-in rather than at the refund counter afterwards. Allow an extra hour at Suvarnabhumi or Phuket for this with a family in tow. Antiques and Buddha images are subject to Thai export controls; a Buddha image in particular may require an export licence from the Fine Arts Department, and this catches well-meaning visitors every year. And keep the Thai receipts even after the refund, because they are the documents you will show on arrival at home.

Shipping, done properly

For furniture, art, a large order of tailoring, ceramics or anything you would rather not carry, use a licensed international freight forwarder with a customs brokerage arm, and instruct them in writing. A proper shipment has a commercial or personal-effects invoice, an accurate description and declared value, the export documentation on the Thai side, and an import declaration and duty payment on the China side. Personal-effects shipments and commercial shipments are treated differently and the forwarder will tell you which yours is.

The failure mode here is a well-meaning shop offering to send it for you. Sometimes that is a genuine arrangement with a forwarder and sometimes it is an under-declared parcel in your name, which becomes your problem at the receiving end. Ask who the carrier is, ask for the airway bill or bill of lading, ask what value will be declared, and insure the shipment for what it is worth. If the answer is vague, take the item to a forwarder yourself.

The short checklist

None of this is onerous once it is a habit. It takes about twenty minutes of attention spread across a two-week trip, and it converts the last two hours of the holiday from a source of anxiety into a formality.

Duty-free allowances, parcel tax rates, currency declaration thresholds and restricted item lists are set by the General Administration of Customs of China and change from time to time; verify the current rules with China Customs (GACC) before you travel and before any substantial purchase, confirm foreign exchange requirements with your bank and the State Administration of Foreign Exchange, and confirm Thai export controls on antiques and Buddha images with the Fine Arts Department.

This briefing is general information, not legal, tax or investment advice. Thai rules change frequently and individual cases differ. Verify current requirements with the relevant authorities, including the Immigration Bureau, the Board of Investment, the Land Department, the Department of Business Development and the Revenue Department, and take advice on your own facts before acting.