---
title: "What Are the Core Formulas and Applicable Conditions for Export Tax Refund Calculation of Foreign Trade Enterprises Under General Trade Mode?"
description: "When manufacturing enterprises new to foreign trade calculate export tax refund on their own，calculation discrepancies often occur due to misunderstanding of exemption-credit-refund rules and incorrect document matching，which may even trigger tax inspection risks. They need to first clarify the core tax basis，distinguish the different calculation logics between foreign trade enterprises and manufacturing enterprises，sort out key nodes of document review in advance，and screen out errors through p..."
url: "https://www.sh-zhongshen.com/en/qa/core-formulas-and-eligibility-for-export-tax-refund-calculation-of-general-trade-foreign-trade-enterprises.html"
language: "en"
type: "Q&A"
category: "Export Tax Rebate Q&A"
datePublished: "2026-10-27"
dateModified: "2026-10-27"
brand: "Zhongshen Trading China"
answerCount: 9
---

# What Are the Core Formulas and Applicable Conditions for Export Tax Refund Calculation of Foreign Trade Enterprises Under General Trade Mode?

## Question

 I am the head of a small and medium-sized electrical and mechanical equipment manufacturing enterprise based in Shanghai, China. I have been in foreign trade for 3 years, and previously always entrusted an agency to handle export tax refund. This year, to cut costs, I plan to build my own team to handle this work. Last month, I tried to calculate the tax refund for a 1.3 million EUR general trade order from Germany, and the result was over 80,000 RMB less than the tax refund of a similar order handled by the agency in the same period last year. I checked the VAT special invoices and customs declarations for three or four days but still could not find the problem. I am so anxious that I cannot even eat properly, worried that I made mistakes somewhere that will affect the tax refund progress, and even trigger an inspection warning from the tax bureau. In addition, we also have small orders for cross-border e-commerce B2B, I do not know if the tax refund calculation method for this type of order is the same as that for general trade, I would like to get detailed answers to how export tax refund is calculated, what common mistakes are easy to make, and what are the calculation differences between different business models. 

## Answers
                            
### Answer 1 — Best Answer

First，it is necessary to clarify the difference in calculation logic between different business entities and trade modes，**manufacturing enterprises apply the exemption-credit-refund calculation logic，while foreign trade enterprises apply the exemption-refund calculation logic**，and for cross-border e-commerce B2B mode，the corresponding trade code (such as 9710，9810) shall be matched to select the calculation method.

Pre-document review details: It is necessary to verify that the product name，specification and quantity on the VAT special invoice for purchased goods are completely consistent with the declaration content on the export customs declaration，and the invoice issuing date shall be earlier than the export date on the customs declaration. For cross-border e-commerce B2B，it is also required to additionally match the comprehensive pilot area filing certificate，cross-border e-commerce platform order screenshot and logistics tracking order，**ensure no logical conflict in document information**.

Connection of core calculation nodes: Manufacturing enterprises shall calculate step by step according to the fixed process: first，calculate the current non-exempt and non-deductible tax amount，second，calculate the current taxable amount，third，calculate the exemption-credit-refund tax amount，fourth，compare the absolute value of current taxable amount with the exemption-credit-refund tax amount，and determine the final tax refund amount and exemption-credit tax amount. For foreign trade enterprises，the tax-exclusive amount stated on the VAT special invoice of purchased export goods is directly used as the tax basis，multiplied by the export tax refund rate of the corresponding commodity to get the tax refund amount.

Contingency plan for abnormalities: If there is a discrepancy between the calculation result and the expectation，first check whether non-cargo costs such as freight，insurance premium and commission are mistakenly included in the tax base，or the commodity tax refund rate is misused. You can submit data through the export tax refund pre-declaration module of the electronic tax bureau，obtain the pre-audit feedback from the tax authority，and correct the calculation error in time. If a tax doubt warning is triggered，you need to submit supporting materials to explain the situation within 3 working days to avoid affecting the tax refund progress.

Final compliance implementation: After completing the formal declaration，you need to organize and file documents such as customs declarations，VAT special invoices，logistics documents，contracts，and keep them for no less than 5 years，ensure the consistency of capital flow，goods flow，invoice flow and contract flow (four flows consistency)，so as to avoid tax inspection risks from the root cause.

**status:** accepted
**Author:** Kevin Lin
**Date:** 2026-10-27

### Answer 2

The tax basis of export tax refund calculation is directly bound to the declaration content of the customs declaration. If the transaction mode declared on the customs declaration is CIF, the transaction price shall be converted into FOB price (CIF price - freight - insurance premium - commission) as the tax base.

If CIF price is directly used for calculation by mistake, the tax basis will be overestimated, triggering tax doubts. In addition, the commodity code on the customs declaration shall match the commodity code on the VAT special invoice by more than 90%.

If the commodity code classification is wrong, it will lead to wrong application of tax refund rate, and deviation between the calculated tax refund amount and the actual tax refund amount. If the content of the customs declaration is found wrong, you need to apply to the customs for modification or cancellation of the customs declaration within 1 year from the date of export, and carry out tax refund calculation after correction, so as avoid failure of tax refund review caused by wrong customs data.

**status:** suggested
**Author:** Andy Guo
**Date:** 2026-10-27

### Answer 3

Logistics documents are important supporting materials for export tax refund calculation. If CIF transaction mode is adopted, corresponding freight invoice and insurance premium invoice shall be provided, which are used to deduct relevant fees during calculation and determine the FOB tax basis. Under cross-border e-commerce B2B mode, the number of pieces, weight and goods description on the logistics list shall be completely consistent with those on the customs declaration and VAT special invoice.

If the logistics document information does not match the declaration documents, the tax basis for tax refund calculation will not be recognized by the tax authority. In addition, if the goods are transshipped, full-process logistics documents shall be provided, and only domestic logistics documents are not accepted, otherwise it will be deemed as incomplete documents, and tax refund cannot be calculated normally. If the logistics documents are lost, you need to apply to the logistics service provider for reissuance in time, and affix the service provider's official seal as an alternative document for tax refund calculation.

**status:** suggested
**Author:** Grace Wang
**Date:** 2026-10-27

### Answer 4

Export tax refund calculation needs to be adjusted in accordance with international tax rules. If an enterprise applies for VAT deferral in the destination country, it needs to ensure that the tax basis of domestic export tax refund calculation is consistent with the FOB price declared for VAT in the destination country, so as to avoid double taxation or tax leakage risks.

For cross-border related party transactions, if the transaction price is lower than 70% of the price of similar non-related party transactions in the same period, the tax authority will adjust the tax basis according to the fair price, resulting in a decrease in the calculated tax refund amount. In addition, if an enterprise has mixed export of cross-border services and goods, it needs to calculate the sales of goods and services separately. The service part cannot enjoy the export tax refund policy, and mixed calculation will lead to wrong calculation of the overall tax refund amount and trigger tax inspection.

**status:** suggested
**Author:** Cindy Chen
**Date:** 2026-10-27

### Answer 5

Export tax refund calculation needs to meet the compliance requirements for foreign exchange collection. The difference between the collected foreign exchange amount and the FOB price on the customs declaration shall be controlled within 5%.

If the difference exceeds 5%, corresponding written explanation materials (such as market price fluctuation certificate, commission agreement, etc.) shall be provided, otherwise the tax authority will adjust the tax basis and reduce the tax refund amount. In addition, foreign exchange collection shall be completed within the VAT declaration period of April next year from the date of export.

If foreign exchange is not collected on time, you need to apply for deferred foreign exchange collection filing within the declaration period, otherwise it will be regarded as domestic sales for taxation, and cannot enjoy the export tax refund policy. If the foreign exchange collection certificate is lost, you need to apply to the bank for reissuing the foreign exchange memo, and affix the bank's official seal as a compliant supporting material for tax refund calculation.

**status:** suggested
**Author:** Daniel Xu
**Date:** 2026-10-27

### Answer 6

The clause agreement of the export contract directly affects the compliance of tax refund calculation. The contract shall clearly specify the transaction mode, goods description, payment terms and other contents, which shall be completely consistent with the information on the customs declaration, VAT special invoice and foreign exchange collection certificate.

If the transaction mode agreed in the contract is FOB, but the declared transaction mode on the customs declaration is CIF, it will lead to inconsistency of four flows, the tax authority will question the authenticity of the tax basis, and will not recognize the calculated tax refund amount. In addition, the contract shall clearly specify that the payment time is within 180 days from the date of export.

If foreign exchange is not collected beyond this period, the reason shall be stated in the contract, and deferred foreign exchange collection filing shall be applied to the tax authority, so as to avoid failure of tax refund calculation caused by non-compliant contract clauses. If the contract content is wrong, you need to sign a supplementary agreement with the overseas customer in time, and the corrected version shall be used as the supporting material for tax refund calculation.

**status:** suggested
**Author:** Michael Zhang
**Date:** 2026-10-27

### Answer 7

If the export goods are found inconsistent with the declared content during on-site customs inspection, such as the quantity and specification of the goods are inconsistent with the customs declaration, the customs will issue an inspection record and require modification of the customs declaration content, and the corrected customs declaration data will be used as the basis for tax refund calculation. If the inspection finds that the goods belong to prohibited or restricted export categories, it will lead to failure of export tax refund application, and will be regarded as domestic sales for taxation.

In addition, if the customs issues a cargo quality identification report during the inspection, the report shall be used as a supporting material for tax refund calculation. If the report shows that there are quality problems with the goods, the tax basis shall be adjusted according to the actual export quantity, so as to avoid wrong tax refund calculation caused by inconsistency between the declared quantity and the actual export quantity. If you disagree with the inspection result, you can apply to the customs for re-inspection within 15 days from the date of receiving the inspection record.

**status:** suggested
**Author:** Eric Zhou
**Date:** 2026-10-27

### Answer 8

Export tax refund calculation needs to meet the compliance requirement of four flows consistency, that is, the information of capital flow (foreign exchange collection memo), goods flow (logistics documents), invoice flow (VAT special invoice) and contract flow (export contract) completely match. If any flow information is inconsistent, the tax refund calculation result will not be recognized by the tax authority.

Before formal calculation, pre-declaration shall be conducted through the electronic tax bureau, the tax authority will feedback doubt information, such as inconsistency between tax basis and customs declaration data, wrong application of tax refund rate, etc. You need to correct the calculation data according to the feedback information before formal declaration. In addition, document filing shall be completed within 15 days after formal declaration, and the filed documents shall be kept for 5 years. If you fail to file as required, the already refunded tax will be recovered and a fine will be imposed.

**status:** suggested
**Author:** Jason Wu
**Date:** 2026-10-27

### Answer 9

Export tax refund calculation is directly related to supply chain cost management. Manufacturing enterprises need to ensure that the production cost of export goods is calculated accurately, including direct materials, direct labor, manufacturing expenses, etc. If the production cost is calculated incorrectly, it will lead to wrong calculation of current non-exempt and non-deductible tax amount, which will affect the calculation of exemption-credit-refund tax amount. Foreign trade enterprises need to ensure that the purchase cost of purchased goods is consistent with the amount on the VAT special invoice.

If there are rebates or discounts, the rebates and discounts shall be deducted from the purchase cost before being used as the tax basis. In addition, supply chain inventory management needs to be synchronized with export customs declaration data. If the inventory outbound quantity does not match the export quantity on the customs declaration, the tax basis for tax refund calculation will be overestimated or underestimated, triggering tax doubts. By establishing a linkage mechanism between supply chain data and tax refund calculation data, the deviation of tax refund calculation caused by wrong supply chain data can be effectively avoided.

**status:** suggested
**Author:** Evelyn Li
**Date:** 2026-10-27

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