If I worked for Doordash, what do I put as the business name and business address?

You put your name and address.  You are the owner of your own self employment business.  You are in business for yourself.  Use your own info.  The people or company that pays you is your customer or client.  You are considered to have your own business for it.  YOU are the business.

You need to fill out schedule C for self employment business income and pay self employment tax in addition to regular income tax on it.  The SE tax is to pay Social Security and Medicare tax that wasn't taken out like on a W2.

You use your own name and ssn or business name and EIN if you have one.   You should say you use the Cash Accounting Method and all  income is at risk.  After you put in your income and expenses  if your net profit is $400 or more you will pay 15.3% for 2013  Self Employment tax in addition to your regular income tax.  The Schedule SE will be automatically filled out for it.

You can enter Self Employment Income into Online Deluxe or Premier but if you have any expenses you will have to upgrade to the Self Employed version.

How to enter income from Self Employment

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...

Here is some IRS reading material……

IRS information on Self Employment

http://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/Self-Employed-Individuals-Tax-Center

Pulication 334, Tax Guide for Small Business

http://www.irs.gov/pub/irs-pdf/p334.pdf

Publication 535 Business Expenses

http://www.irs.gov/pub/irs-pdf/p535.pdf

You pay Self Employment tax on $400 or more of net profit from self-employment in addition to any regular income tax.  You pay 15.3% SE tax on 92.35% of your Net Profit greater than $400.  The 15.3% self employed SE Tax is to pay both the employer part and employee part of Social Security and Medicare.  So you get social security credit for it when you retire.  

For your business name, if you don't have a separate business name, then leave blank.  For business address, use your personal address - the same one on page one of your tax return.