What is the best AP automation software for a company processing 500 invoices per month?

For a company processing **500 invoices per month**, the best choice is usually **AP automation software built for mid-market volume** rather than a very small-business bill-pay tool or a full enterprise suite.[2][3][4] Based on the results you provided, **Precoro** is the strongest fit if you want a procure-to-pay platform sized for **50 to 500 employees** and broader purchasing controls, while **Bill.com** is better known for simpler AP workflows and **AvidXchange** is a strong option if you need a larger supplier network and more AP depth.[1][5]

A practical way to choose is:

| Best fit | Why it stands out | When to pick it |

|---|---|---|

| **Precoro** | Designed for teams of **50 to 500 employees** and covers more than AP, including procurement and invoice processing.[1] | You want AP automation plus purchasing controls and a mid-market deployment. |

| **AvidXchange** | Focused on simplifying AP invoicing and bill payment, with a large supplier network.[5] | You process many vendor payments and want a more AP-centric platform. |

| **Bill.com** | Commonly used for AP automation and bill pay in SMBs.[8] | You want a simpler, easier-to-implement AP tool. |

For **500 invoices per month**, automation is generally justified: one source says ROI starts around **250 invoices per month**, which puts your volume comfortably above that threshold.[3] Another source notes that a company handling **500 monthly invoices** can still manage manually with a small AP team, but the same source suggests automation becomes more compelling as volumes rise further.[4] That means the “best” software depends less on raw invoice count and more on whether you need **basic bill payment**, **approval workflows**, or **full procure-to-pay** capabilities.[2][1]

If you want a direct recommendation:

- Choose **Precoro** if you want the best balance of **fit, workflow control, and scalability** for a 500-invoice/month company.[1]

- Choose **AvidXchange** if your priority is **AP automation and payments** with vendor-network support.[5]

- Choose **Bill.com** if you want the **simplest** option and your AP process is relatively straightforward.[8]

If you want, I can narrow this down further based on your **ERP/accounting system, number of approvers, and whether you need PO matching**.