Plastic Packaging Tax: April 2027 Audit Trap

The bill has one line you will read and one rule you will not be shown. The line is a rate per tonne. The rule is the awkward one: you can be made to register for plastic packaging tax even when your packs are clean enough to owe nothing. Few suppliers lead with that. And on 1 April 2027 the definition of "recycled" shifts under your feet.

Why does the plastic packaging tax still bite a compliant pack?

Because registration and payment are separate duties: you register once you handle enough plastic packaging components, and you pay only on components below 30% recycled plastic, so a compliant pack still carries filing duty.

GOV.UK's business guidance sets the registration trigger at 10 tonnes of finished plastic packaging components manufactured or imported. For a small importer, that means registering before you owe a penny. Rödl's briefing of 6 March 2026 makes the sharper point: registration is required even when no tax is due because every component clears the line. A compliant pack still comes with a return, a deadline and penalty exposure. Read our take on the EU packaging EPR rules that went live in August and you will see the same pattern: the paperwork arrives first, the cost second.

Now the number. GOV.UK puts the rate from 1 April 2026 at £228.82 a tonne, up from £223.69 a year earlier. The line is a cliff, not a slope. At 29% recycled content you pay the full rate on the whole component; at 30% you pay nothing. Set against the £200 of 2022, my own arithmetic from GOV.UK's rate history gives a rise of about 14% in four years, so budget the next April step before it lands. The same cliff logic runs through California's packaging fees invoiced ahead of final rules: regulators publish the bill first and the detail later.

Four numbers decide whether this is a paperwork problem or a cost problem: where the line sits, what a tonne costs, when registration starts and how long you keep proof.

The record-keeping duty is the one that outlasts everyone's memory. Staff move on, suppliers merge, and a certificate you cannot find is a claim you cannot make. Attach each delivery's declaration to the purchase order, not to someone's inbox.

So the useful question is not whether your pack is green. It is which side of the line each pack lands on, and what you can show HMRC to prove it. The table below separates the two.

Which packs owe tax, and which only owe paperwork?

A pack below the recycled line owes tax and paperwork, while a pack above it owes paperwork alone, provided you pass the registration threshold and can prove every recycled claim to HMRC when asked.

Read down the middle column and one pattern shows: the tax is binary, so the only lever you control is margin. Read the right column and a second one shows: the paperwork is where most of the exposure sits.

What changes for recycled claims on 1 April 2027?

From 1 April 2027, pre-consumer plastic waste no longer counts as recycled, and chemically recycled plastic must be proven by mass balance with third-party certification meeting HMRC's minimum standards.

HMRC released preparation guidance and minimum certification requirements on 28 August 2026, but detailed guidance is not expected until early 2027, according to Packaging Gateway. The rules finalise months before the deadline, and your supplier contracts will not wait for them. My opinion, and only that: a rule landing this late is one HMRC expects importers to absorb at their own cost, so do not hold your breath for a grace period. Our note on sustainable packaging technology and supply chains covers why suppliers rarely volunteer this detail.

Mass balance is an accounting method: a recycler tracks how much recycled feedstock enters a plant, then attributes that amount to output. Packaging Gateway's summary lists an attribution declaration per delivery or batch, six-year record retention, quarterly balancing and site-specific conversion factors. Fuel-use material is excluded from the calculation, so a supplier claim that counts fuel outputs cannot count toward your percentage.

• Ask what share of each supplier's recycled content is pre-consumer waste.
• No third-party certificate, no recycled claim.
• Get written confirmation that fuel outputs are excluded.
• File declarations by delivery, not by quarter.

This week, pull your last twelve months of plastic packaging tonnage, ask each supplier for its offcut share and the certifier's name, then decide by month-end: reformulate with a safe margin above the line, or pay the rate and document everything else.