Bulk SMS can be an effective way to inform donors about tax benefits and other incentives for charitable giving. Here are the steps to follow:

1. Collect phone numbers: First, you need to collect the phone numbers of your donors. Make sure you have their permission to contact them via SMS.
2. Choose a bulk SMS service: There are several bulk SMS services available online. Choose one that fits your needs and budget.
3. Compose your message: Keep your message brief and to the point. Highlight the tax benefits and other incentives for charitable giving, such as tax deductions and matching gift programs. Provide clear instructions on how donors can claim these benefits.
4. Personalize your message: Address your donors by their name in the message. This will make them feel more connected to your charity.
5. Include a call-to-action: Include a call-to-action in your message, such as “Donate now and claim your tax deduction” or “Find out if your employer offers a matching gift program.”
6. Schedule your message: Choose a date and time when most of your donors are likely to be available to receive the message.
7. Send the message: Once you have composed and scheduled your message, send it to your donors.
8. Follow up: Follow up with donors who have claimed the tax benefits or other incentives. Thank them for their support and encourage them to continue giving to your charity.
   Remember to respect your donors’ privacy and preferences. If they opt-out of receiving SMS messages, make sure you remove their phone number from your list. Also, avoid sending too many messages as it may lead to donors feeling overwhelmed and opting-out.