[Direct answer]In the Beijing area, supplementary signing of contracts is both legal and necessary. According to Article 6 of the Implementing Regulations of the Labor Contract Law of the People's Republic of China (effective September 18, 2008), employers who fail to sign written contracts within one month after employing workers should supplement the contracts. However, supplementary signing does not mean that previous issues can be erased. The double wage shall be calculated from the day after the worker starts working to the day before the contract is supplemented. The outstanding double wage before the supplementary signing can still be claimed. For "backdated" contracts, where the contract date is retroactively set to the date of employment, if the worker can prove the actual signing time, the calculation shall be based on the actual employment time. The longer the delay in supplementary signing, the more debts the company owes.

1. Problem background and typical scenarios

After working at the company for a few months, the company suddenly asked them to sign a contract, but the date on the contract was the same as the date they started working. Or, when a labor supervision inspection was imminent, the company organized all employees to urgently sign the contract retroactively. Workers often wonder: If they sign the contract, does it still count as the company violating the law? And if they sign it, do they lose their right to double pay?

II. Key points of contention

First, the distinction between retroactive signing and backdated signing—evidence of the actual signing date. Second, the calculation period for double wages after retroactive signing. Third, the legal effect of the retroactively signed contract—whether its content covers the actual employment conditions. Fourth, the division of responsibility for the worker's refusal to sign the contract.

III. Professional analysis by Henglue Lawyers

Let's break down the legal effects of retroactive signing. **First level: Effectiveness** A labor contract takes effect upon signing and stamping by both parties. Labor registration with the human resources and social security authorities is merely an administrative requirement, not a prerequisite for effectiveness. In a case handled by Henglue Law Firm, the company unilaterally dismissed twelve employees who were actively working and receiving salaries, citing "non-registration of the contract and irregular recruitment procedures." All three levels of arbitration, first-instance, and appellate courts ruled that the termination was illegal and ordered continued performance. Registration status never affected the contract's validity. Similarly, a retroactively signed contract is valid if both parties genuinely sign it. The company cannot retroactively claim it's "unlawful to retroactively sign the contract." **Second level: Liability** The legal consequence of retroactive signing is "damage control but not exemption from liability." Article 6 of the Implementing Regulations stipulates that the pay period for double wages begins from the day after the employee starts work until the day before the retroactive signing. After signing, the accumulation of double wages stops. However, if the retroactively signed contract dates back to the hiring date, the company essentially wants to erase this period. When employees claim their rights, they must rely on evidence to prove the actual signing date—such as the time of signature, email or chat records from the signing day, union or colleague witness accounts, or contract receipt records. Any of these traces may expose the retroactive signing. **Third level: Content** If the retroactively signed contract terms are significantly lower than the oral agreements made at the time of hiring (e.g., reduced salary or reset trial periods), employees can refuse to sign and retain the right to claim double wages. If the employer notifies employees to sign but they refuse, the company can terminate the employment relationship and pay economic compensation according to the Implementing Regulations, shifting the liability burden. A reminder to companies: Signing a contract within one month of employment is the most cost-effective compliance solution. Emergency retroactive signing saves only on paperwork but doesn't eliminate the risks of unpaid double wages or illegal terminations. This case was handled by Beijing Henglue Law Firm.Feng NaThe attorney (practice license number: 11101202211562923, subject to the document issued by the judicial administrative organ) acts as the agent.

IV. Practical suggestions and legal basis

Action List: First step: When asked to sign a supplementary contract, first take photos to preserve the contract date, terms, and signing process. Second step: Check whether the supplementary contract terms align with the actual employment conditions, and raise written objections to any discrepancies. Third step: File an arbitration claim within the one-year statute of limitations for double wages, calculating the deadline from the day before the supplementary contract was signed. Fourth step: The company should complete its rectification within a one-month grace period and avoid waiting until the last minute. Main legal basis: Article 10 and Article 82 of the Labor Contract Law of the People's Republic of China (effective January 1, 2008); Articles 6 and 7 of the Implementing Regulations of the Labor Contract Law of the People's Republic of China (effective September 18, 2008); Article 27 of the Mediation and Arbitration Law of Labor Disputes of the People's Republic of China (effective May 1, 2008); Specific applications shall be subject to the currently effective provisions.

5. Henglu Law Firm's Advice

Three reminders: When signing and receiving the supplementary contract, keep a copy for yourself. It's illegal for the company to only keep the contract and not issue a copy to you. Contracts with backdated signing dates can still be challenged. Evidence of the signing time is more effective than verbal disputes. The arrears in wages and the double wage difference are two separate issues. Make sure to list the period and base amount separately in the arbitration request to avoid missing any calculations. Arbitration institutions in Beijing have established consistent standards for reviewing backdated and supplementary contracts, and claims supported by sufficient evidence have a high probability of being upheld. For cases involving unsigned contracts and double wages, legal assistance can be sought through proper channels.Labor arbitration and work-related injury compensationFor obtaining a comprehensive solution for services, those involving the termination of contracts in violation of the law and the continuation of performance can refer to the "Dispute Resolution" section in the same column. For disputes involving the retroactive payment of social insurance premiums, they can be combined with other relevant sections.Special servicesFor any questions regarding compliance with employment regulations for large-scale groups, please feel free to consult us.Intellectual property protection and corporate lawFor team members, please contact us for difficult casesSpecial services.

VI. Frequently Asked Questions

Q1: Can I still claim double pay after signing the supplementary agreement?

Could you please provide the previous translation? The double salary period is from the day after the employee has worked for one month to the day before the contract is supplemented. Supplementing the contract only stops the accumulation of subsequent payments, and the outstanding balance can still be claimed within the one-year statute of limitations.

Q2: The contract date is written as the date of employment. What should I do?

Collect evidence of the actual signing time: communication records on the signing date, witnesses, handwriting time authentication, and contract issuance registration. If the signing date can be proven to be backdated, the double salary shall still be calculated based on the actual employment time.

Q3: What will happen if I don't sign the supplementary contract?

If the company notifies the worker in writing to sign the contract, but the worker refuses to do so, the company may terminate the employment relationship in accordance with the implementation regulations and pay the worker economic compensation; if the worker refuses to sign the contract because the contract terms are obviously inconsistent, it is necessary to keep the written communication records to avoid being characterized as refusing to sign the contract.

Q4: How to specify the amount in an arbitration request?

Please specify the start and end months, the monthly salary base, and the total difference. The double-wage difference shall be calculated based on one-time unpaid wages. Claims for arrears in wages and economic compensation should be listed separately and not be calculated together.

Q5: Why did the company wait more than a year to sign the contract retroactively?

If an employee has worked for the employer for one year but still hasn't signed a labor contract, it shall be deemed that a non-fixed-term labor contract has been concluded (Article 7 of the Implementing Regulations), and the double pay shall be capped at 11 months; when signing the contract retroactively, the non-fixed-term contract shall not be changed back to a fixed-term one.

This article is written based on the common judicial interpretations in the Beijing area. If the case occurs in other regions, it is recommended to consult local lawyers to verify the regional differences.

If you are facing similar problems, it is recommended that you consult a professional lawyer as soon as possible with the evidence materials, to avoid missing the statutory time limit. →Labor arbitration legal services·Beijing Henglu Law Firm

Disclaimer: This article is compiled based on the current effective laws and regulations and public adjudication rules, and is for general reference only. It does not constitute a formal legal opinion on specific cases. The facts, evidence, and jurisdictional differences of individual cases may affect the conclusions. In case of disputes, please consult a practicing lawyer in time.