Between 1996/97 and 2021/22, revenue collections by the Tanzania Revenue Authority (TRA) in Zanzibar have shown significant growth, rising from TShs 16,671.4 million to TShs 356,042.2 million. This equates to a total growth of 2,035% over 25 years, reflecting an average annual growth rate of approximately 13.2%. This strong overall trend highlights long-term improvement in revenue collection and economic activities in Zanzibar, despite fluctuations across different periods.

Period-by-Period Analysis

• Early Period (1996-2000):
  During this initial phase, Zanzibar’s revenue collections grew impressively, from TShs 16,671.4 million to TShs 39,098.8 million, marking a 134.5% increase over four years. The average annual growth rate was about 23.8%, driven by foundational efforts to enhance revenue systems and expand economic activities.
• Decline and Stabilization (2000-2005):
  From 2000, revenue collections experienced a sharp downturn, falling from TShs 39,098.8 million to TShs 20,734.9 million by 2005. This 47% decrease represented the most severe dip in the dataset, potentially caused by economic challenges or inefficiencies in collection methods. The period was marked by an average growth rate of -0.9% annually, indicating stagnation and stabilization attempts.
• Recovery and Growth (2006-2015):
  Following the downturn, recovery took place from 2006, with collections rising from TShs 22,374.6 million in 2005/06 to TShs 143,936.4 million in 2014/15. This impressive 543% growth showed resilience, as the average annual growth rate reached around 23%. Improved administration and economic activities likely supported this phase of robust growth.
• Recent Period (2015-2021):
  From 2015/16, revenue collections grew from TShs 170,967.6 million to TShs 298,157.7 million in 2020/21, indicating a 74.4% rise with an average annual growth rate of around 11.8%. Although growth was slower than in earlier periods, this phase still demonstrated consistent improvement, which contributed to long-term revenue expansion.

Notable Year-over-Year Changes

The analysis highlights key years of growth and decline:

• The largest single-year increase occurred in 2017/18, with a 25.6% growth rate.
• The most significant annual decline was in 2000/01, where collections fell by 40.2%.
• The most recent growth from 2020/21 to 2021/22 saw a strong 19.4% increase, indicating recovery and resilience in Zanzibar’s revenue collection efforts.

Share of Total TRA Collections

Despite Zanzibar’s overall revenue growth, its share of total TRA collections has declined:

• 1996/97: Zanzibar accounted for 3.2% of the total collections.
• 2020/21: This share decreased to 1.7%.
• 2021/22: The share further dropped to 1.6%.

This trend suggests that although collections in Zanzibar have increased, growth in mainland Tanzania has outpaced that in Zanzibar, reducing Zanzibar’s relative contribution to the total collections.

Growth Phases

• Slowest Growth Phase (2000-2005): The period marked a challenging time with an average annual growth rate of -0.9%, a result of economic setbacks and collection difficulties.
• Fastest Growth Phase (2015-2018): Revenue collections grew rapidly in these years, averaging 22.3% annually, driven by reforms and enhanced economic activities.
• Most Stable Growth Phase (2010-2015): This period was marked by steady growth, with consistent annual increases of 13-15%, showing a balance between collection efficiency and economic activity.

Recent Performance (Last 5 Years)

• 2017/18: Achieved high growth of 25.6%.
• 2018/19: Maintained positive growth at 13.1%.
• 2019/20: Experienced a slight decline of -3.5%, likely due to economic or external factors.
• 2020/21: Growth rebounded at 6.7%.
• 2021/22: Strong recovery with a 19.4% increase.

Summary

Over the years, TRA Zanzibar has shown an upward trend in revenue collections, albeit with fluctuations. Despite a reduction in its share of the total TRA collections, Zanzibar has maintained growth, particularly through strong phases of recovery and steady improvement in recent years. The findings indicate that while TRA Zanzibar faces challenges, the region’s economic activities and revenue collection efficiency have improved significantly over time.

The revenue collection trends for TRA Zanzibar with key insights into Zanzibar's economic environment, fiscal policy effectiveness, and overall revenue collection dynamics over the last 25 years:

1. Long-Term Growth with Fluctuations

• The substantial 2,035% growth over 25 years suggests an overall positive trajectory in Zanzibar’s economic activities and revenue collection efficiency.
• Despite this, the fluctuations—periods of decline, recovery, and stabilization—show that Zanzibar’s revenue base is susceptible to both internal and external factors, which can significantly impact growth rates.

2. Early Growth and Subsequent Stabilization

• The high growth rate in the early years (1996-2000) likely indicates foundational economic growth and perhaps initial stages of improved tax administration.
• However, the severe decline from 2000-2005 suggests vulnerabilities, potentially tied to administrative challenges, economic contractions, or changes in tax policy or compliance.

3. Improvement in Revenue Collection Efficiency

• The significant recovery and growth from 2006 onward highlight improvements in revenue collection practices, likely influenced by better tax administration, policy reforms, and economic development efforts in Zanzibar.
• Steady growth phases, especially the stable 2010-2015 period, suggest that the TRA developed more consistent and effective revenue collection mechanisms.

4. Lower Share in Total TRA Collections

• Zanzibar’s declining share of total TRA collections—dropping from 3.2% in 1996 to 1.6% in 2021—indicates that mainland Tanzania has grown faster in revenue collection. This could reflect a larger economic expansion on the mainland compared to Zanzibar, emphasizing the need for Zanzibar to diversify and strengthen its revenue base.

5. Resilience in Recent Years

• The recovery and growth in recent years, including a 19.4% increase in 2021/22, reflect resilience and adaptability, possibly supported by more robust administrative frameworks and economic activity post-pandemic.
• Continued positive year-over-year performance, despite some setbacks, suggests that TRA Zanzibar can maintain growth if current trends in policy and administrative efficiency continue.

6. External and Economic Sensitivity

• The periodic declines highlight Zanzibar’s sensitivity to economic and possibly political factors that can affect tax collection.
• With noticeable declines like those in 2000-2005 and smaller dips in specific years, there is a clear indication that Zanzibar’s revenue performance could benefit from a focus on economic diversification and stability.

Overall Implication

The research suggests that while Zanzibar has demonstrated long-term growth in revenue collection, it needs to address its reliance on relatively narrow economic drivers and further improve revenue administration to minimize fluctuations. Additionally, fostering consistent economic growth, reducing dependency on specific sectors, and expanding the tax base could help maintain or increase Zanzibar’s share of total TRA collections.