What is the best software for managing a marketing budget?

Check out the MRM Tool MARMIND Enterprise. Designed specifically for Marketing with focus on budgeting! https://www.marmind.com/enterprise/en/ Its possible to plan budgets, expenses and forecasts without confusing, distributed spreadsheets. You can make valid predictions even across multiple departmens, countries and multiple currencies. Marketing teams of any size can work together without error-prone spreadsheets and cumbersome version control. By integrating existing data from marketing and ERP systems you get accurate insights into all aspects of your marketing – from forecasts to results.Another great aspect: MARMIND also features Digital Asset Management, Workflows and audit trails.

The only software our company has purchased for managing Marketing budgets is Allocadia. The software is okay, not great.

Allocadia is easy to use, specific to marketing and their customer service is awesome. http://allocadia.com/

Try http://www.Allocadia.com . The product is great and if you have any questions the support team is very knowledgeable and responds quickly.

Use excel.  Spend the money on good accountant.  Focus your energy on the most important things, of which bookkeeping is not.

http://www.allocadia.com Allocadia acts like a spreadsheet without the trappings of Excel.  Built for marketers who are constantly thinking of better ways to spend money while spending efficiently in the process.  Allocadia gives you up-to-date information on your budget, rolls it up through the organization, and connects with corporate ERP and/or sales data to give the complete picture.

Here with http://TaskBeat.com we focus on building a simple and effective budgeting platform for small businesses. You get a template with a list of budgeting categories on the start, all you do is fill in the numbers and you end up with pretty much working budget sheet that should work well for most of small businesses.

I worked for a big online company recently and they used a custom app built on top of MS Access.  I would recommend Excel or if you can afford it, have somebody create a custom app on top of Excel/Access.

If you use Marketo for marketing automation, there is a product you can add on for managing marketing budgets and spend. It's integrated with the rest of the platform, so you can do your ROI reporting on your programs/channels using the costs right out of your budget. Full disclosure - I work for Marketo.