Seasonality can be a major issue when forecasting revenue because it affects consumer behavior and, as a result, sales. Seasonal trends can cause fluctuations in demand which impacts businesses' ability to accurately predict future revenues. To address this issue, businesses should take seasonality into consideration when creating their forecasts and adjust accordingly. This could include adjusting the forecast to account for any drastic changes in sales or expenses due to seasonal factors. Additionally, analyzing long-term data can help identify any potential seasonal patterns, allowing businesses to make more accurate predictions for the future.