Plastic Packaging Tax - what your data needs to look like for HMRC

The UK Plastic Packaging Tax has been live since April 2022. The policy rationale is well understood. What many businesses still struggle with is whether their packaging data is good enough to support accurate returns and withstand an HMRC audit. This article covers what the data needs to look like - not the policy, but the practical data requirements.

From 1 April 2027, pre-consumer recycled plastic no longer counts towards the 30% threshold, and chemically recycled plastic can count through a certified mass balance approach. Our post on Plastic Packaging Tax from April 2027 covers what that changes.

The 30% threshold is per component

PPT applies to individual plastic packaging components that contain less than 30% recycled content by weight. This is not a product-level assessment. A multi-component product - say a PET bottle with a PP cap, a BOPP label, and a PE sleeve - has each plastic component assessed individually.

If the bottle body contains 40% recycled PET, it is exempt. If the PP cap contains 5% recycled content, it is taxable. The assessment is per component, not per SKU or per product. Your data needs to reflect this granularity.

The evidence burden

HMRC expects you to be able to demonstrate the recycled content percentage for each component. "We believe it contains recycled content" is not sufficient. You need supplier documentation, certificates of recycled content, or mass balance evidence.

This means your recycled content figures need to be traceable to a source - typically a supplier declaration or a third-party certificate. If you are recording recycled content percentages in your system but cannot link them back to evidence, your data is not audit-ready.

The null vs zero problem

This is the most common data quality issue in PPT compliance. Many packaging databases do not distinguish between "we know this component contains 0% recycled content" and "we have no data for this component". Both show as blank or zero in the system.

The implications are different. A component confirmed at 0% recycled content is taxable - but at least you know where you stand. A component with no data is also taxable (because you cannot evidence the 30% threshold), but it also represents a data gap that might be resolvable. If the supplier actually does use recycled content but has not provided the data, you are paying tax unnecessarily.

Merchant Packaging stores recycled content as a nullable value. Null means not recorded - the data has not been provided. Zero means the supplier has confirmed zero recycled content. Any positive value is the declared percentage. This three-state model is essential for accurate PPT reporting and for identifying where supplier data collection can reduce your tax liability.

Supplier data quality

The recycled content percentage almost always comes from the supplier, not from your own testing. This creates a dependency: if the supplier cannot provide it, or provides it at the wrong granularity, your PPT return is unreliable.

Common problems include suppliers providing recycled content at the product level rather than the component level, suppliers who say "yes, it contains recycled content" without giving a percentage, and suppliers who provide a percentage once and never update it even as formulations change.

The fix is a structured supplier data intake process that requests recycled content at component level, validates the response (is it a percentage? is it between 0 and 100?), records when the data was provided, and flags components where the data is missing or stale.

Keeping data current

Recycled content can change between batches. A supplier who was providing 35% recycled PET may drop to 25% if their recycled resin supply is disrupted. A component that was exempt last quarter may be taxable this quarter.

Periodic re-collection from suppliers is necessary. The question is how often. HMRC does not prescribe a frequency, but if you are filing quarterly returns, quarterly re-verification of recycled content from key suppliers is a reasonable baseline.

What good PPT data looks like

In summary, audit-ready PPT data has these characteristics: component-level granularity (not product or SKU level), a nullable recycled content field that distinguishes between null, zero, and positive values, supplier evidence linked to each recycled content figure, and date stamps showing when the data was last confirmed.

Merchant Packaging was built for exactly this level of granularity. Recycled content is stored per component as a nullable value, supplier data flows in through a structured portal with validation, and a Plastic Packaging Tax exposure report is produced from the same records.