Most states require LLCs to keep business money separate from personal money, and a business checking account is the standard way to do that
You do not legally need a checking account to form an LLC. You can start one with just articles of organization and a registered agent. But once the LLC is operating and taking in money, the separation between your personal finances and the business's finances becomes a legal requirement in most states—not because of a rule about checking accounts specifically, but because of a rule about piercing the corporate veil.
If you mix personal and business money in the same account, a court can decide that your LLC is not really separate from you as an individual. That means creditors or someone suing the business can come after your personal assets—your house, your car, your savings—instead of just the business's assets. A business checking account is not the only way to maintain that separation, but it is the clearest and cheapest way to prove you did.
Some states have explicit rules about this. Others leave it to case law. Either way, the practical answer is the same: open a business account before you start moving money through the LLC.
Key Takeaways
- Mixing personal and business money in one account can expose your personal assets to business lawsuits or creditor claims, even though you formed an LLC to prevent that.
- A business checking account costs $0 to $15 per month at most banks and is the standard way to show a court that you kept finances separate.
- You need an EIN (Employer Identification Number) from the IRS before you can open a business account, which takes 15 minutes online or a few days by mail.
- Some banks require articles of organization or an EIN letter; others ask for both; a few will open an account with just your Social Security number if the LLC is new.
- If you are a single-member LLC taxed as a sole proprietorship, you can use a personal account temporarily, but you should move to a business account before the IRS or a creditor questions the separation.
What happens if you do not separate your finances
The legal concept is called piercing the corporate veil. An LLC exists to shield your personal assets from business debts and lawsuits. But courts will ignore that shield if you treat the business and yourself as the same entity. Mixing money is the most common reason a court decides to pierce the veil.
The scenario: your LLC owes a vendor $10,000. The vendor sues. Your LLC has $2,000 in assets. Normally, the vendor gets $2,000 and writes off the rest. But if you have been paying personal expenses from the business account and business expenses from your personal account, the court may decide the LLC was never really separate. Now the vendor can go after your personal bank account, your house equity, or anything else you own.
This is not theoretical. It happens in small claims court, in contract disputes, and in injury cases. The cost of opening a business account—usually free or $5 to $15 per month—is insurance against this risk.
How to get an EIN before opening an account
You cannot open a business checking account without an Employer Identification Number (EIN), even if you have no employees. An EIN is a nine-digit number the IRS assigns to your LLC so it can track the business separately from you.
The fastest way is online at irs.gov/ein. You answer questions about the LLC, your name, and the business address. The process takes 15 minutes. The IRS issues your EIN when ready on screen, and you can write it down or screenshot it. You do not need to wait for a letter.
If you cannot explore online—some states or situations do not may have access to—you can mail Form SS-4 to the IRS. That takes 4 to 6 weeks. You can also call the IRS Business and Specialty Tax Line at 1-800-829-4933, but phone lines are often backed up.
Once you have the EIN, you have what you need to walk into a bank or explore online for a business account.
What documents banks ask for when you open an account
Banks vary in what they require, but most ask for three things: proof of the LLC's existence, proof of your identity, and the EIN. Here is what that usually means in practice.
| What the bank asks for | What counts |
|---|---|
| Proof the LLC exists | Articles of organization from your state, or an EIN assignment letter from the IRS (you can request this online after you get your EIN) |
| Your identity | Driver's license, passport, or state ID |
| The EIN | The nine-digit number from the IRS, or the letter the IRS mailed you |
| Proof of address (sometimes) | Utility bill, lease, or mortgage statement in your name at the business address |
Some banks are stricter. Chase and Bank of America typically want the articles of organization and an EIN letter. Smaller regional banks or online banks like Mercury or Brex often ask for less and move faster. If you are opening an account in person, call ahead and ask what they need so you do not make a second trip.
Single-member LLCs taxed as sole proprietorships: the gray area
If your LLC has one owner (you) and you have not elected to be taxed as a corporation, the IRS treats it as a disregarded entity. That means for tax purposes, the LLC and you are the same. Some people use this as a reason to skip the business account and use a personal account instead.
This is a mistake. The IRS treating the LLC as disregarded for tax purposes does not mean it is disregarded for liability purposes. You still formed an LLC to separate your personal assets from business liability. A court will still look at whether you kept finances separate. A personal account undermines that argument.
If you are in this situation and do not yet have a business account, open one now. If you have been using a personal account, move to a business account before you face a lawsuit or a creditor dispute. The longer you wait, the harder it is to argue that the separation was ever real.
The cost and setup time for a business account
Most banks charge $0 to $15 per month for a basic business checking account. Some waive the fee if you keep a minimum balance (often $500 to $2,500) or set up direct deposit. Online banks like Mercury, Wise, or Brex often have no monthly fee at all, though they may charge for wire transfers or other services.
Setup takes 10 to 30 minutes if you explore online, or 30 to 45 minutes if you go to a branch in person. You will need the documents listed above. Once approved, you usually get a debit card and checks within 5 to 10 business days, though you can start using the account when ready for transfers and bill pay.
The time investment is small. The protection is large. If you have not opened a business account yet, do it this week.
What to do if your LLC is already mixing personal and business money
If you have been running the LLC through a personal account, the fix is straightforward but requires some care. Open a business account now. Then, over the next 30 days, move all business money into the new account and stop using the personal account for business expenses.
You do not need to go back and reclassify every transaction from the past. What matters to a court is whether you are maintaining separation going forward. Starting today, keep them separate. If you are audited or sued later, you can show that you corrected the problem and have been careful since.
If the LLC has been operating for years and the mixing is extensive, talk to a tax accountant or business attorney before you make changes. They can help you document the separation in a way that holds up if someone challenges it later.
Frequently Asked Questions
Can I use my personal account if the LLC is brand new and has not made any money yet?
Technically, yes—there is no rule against it. But the moment money starts flowing, open a business account. The longer you wait, the harder it is to argue later that you were maintaining separation. It takes 20 minutes to open one online, so do it before your first customer pays you.
What if I have multiple LLCs? Do I need a separate account for each one?
Yes. Each LLC is a separate legal entity, and each one needs its own account. If you mix money from two LLCs in one account, you lose the liability protection for both of them. Open one account per LLC.
Do I need a business account if I am a sole proprietor, not an LLC?
No legal requirement exists, but it is still a good idea. A business account makes tax time easier and shows the IRS you are running a real business. For liability purposes, though, a sole proprietorship offers no protection either way—your personal and business assets are already legally the same.
Can I open a business account online, or do I have to go to a bank branch?
Most banks let you explore online. Online-only banks like Mercury or Wise are often faster and have fewer requirements. If you go to a branch, call first to confirm they have what they need so you do not waste a trip.
What if the bank asks for a business license and I do not have one?
A business license is not required to open a business account. If a bank asks for one, ask them what they actually need—often they will accept the articles of organization instead. If they refuse, try a different bank. You have options.