# Billing FAQs

**Q: What are the credit limits for a paid account?**  
**A**: View real-time credit limits for paid accounts here: [https://chartgen.ai/billing](https://chartgen.ai/billing).

**Q: How is the fee for a plan upgrade calculated?**  
**A**: Upgrading takes effect immediately. We calculate new credits based on the price difference between plans using the new plan's conversion rate. Your billing cycle remains unchanged.

**Q: Why haven't my credits been added to my account after payment?**  
**A**: Credits typically reflect within 5 minutes of payment. Delayed appearance may indicate payment processing or system issues. Contact customer service if unresolved.

**Q: Can unused credits for a paid membership be carried over to the next month?**  
**A**: Yes. All credits expire 3 months after deposit and remain usable during this period.

**Q: When are the credits for a paid membership reset? Is it at the beginning of the month?**  
**A**: Credits renew at your personal billing cycle start. Example: A subscription on August 19th replenishes monthly on the 19th at 00:00 UTC.

**Q: Can I get an invoice?**  
**A**: Access and download invoices via **Management > Billing > Invoices**.

**Q: How do I cancel my subscription plan?**  
**A**: Disable auto-renewal to prevent future charges. The current month's plan remains active until the billing cycle ends.

**Q: Is there a free trial period?**  
**A**: The permanent Free plan provides 100 credits monthly.

**Q: Will the subscription automatically renew?**  
**A**: Enabled auto-renewal ensures uninterrupted service by renewing at cycle end. Success triggers a confirmation email; toggle off anytime.

**Q: Will I receive a notification before renewal?**  
**A**: Notifications are sent only post-payment (success or failure).

**Q: How do I pay for the subscription?**  
**A**: We process payments via Stripe, supporting major credit/debit cards.

**Q: How do I know if I’m eligible for an Education Plan?**  
**A**: Eligibility is verified via your institutional email. Supported domains include **".edu"**, **".ac.uk"**, **".edu.au"**, **".ac.jp"**, **".edu.cn"**, **".ac.in"**, and **".edu.sg"**. You can subscribe to the 10% off Education Plan using these email domains.

**Q: Refund & Downgrade Policy**  
**A**:  
**Refunds**: All subscription fees are non-refundable.  
**Downgrades**: Contact customer service via email for assistance.